Mexico, he charged, “has invaded our territory and shed American blood upon American soil. ” Two days after Polk’s speech, Congress declared war on Mexico. The Mexican-American War had begun. The Fall of New Mexico and California A few months later, General Stephen Kearny led the Army of the West out of Kansas.In the spring of 1846, tensions mounted between the United States and Mexico, and the Mexican-American War (1846-1848) started, in part, over a border dispute between the two countries. Mexico claimed the Nueces River to be Texas’s southern border, but the United States insisted the border lay further south at the Rio Grande River.Jun 17, 2022 · From the American Battle Monuments Commission, this site remembers soldiers from the Mexican War who are buried in the Mexico City National Cemetery. Robert E. Lee Mexican War Maps An online exhibit of 30 original military maps owned by Robert E. Lee from the holdings of the Virginia Military Institute. U.S.-Mexican War (1846-1848) Nevertheless, the Mexican-American War had far-reaching consequences for both the United States, Mexico, and the Indigenous peoples whose land both nations claimed. First among these was the. cession. of about one third of Mexico’s territory to the United States, a landmass of over 338,000,000 acres. A map of the campaigns of the Mexican-American War, via the US Army As expected, the US quickly moved to protect its borders. American armies would move south from the Rio Grande into Mexico and from Kansas into New Mexico Territory to take Santa Fe. After taking Santa Fe against little opposition, General Kearney headed west to California (map ...The small American force had sustainedcomparatively serious losses-124 killed and 582 wounded-but they doggedly continuedtheir attack on Chapultepec, which finally fell on 13 September 1847.American losses were 138 killed and 673 wounded during the siege of the fortress.Mexican losses in killed, wounded, and captured totaled about 1,800. The ...129 wounded. 26 missing. The Battle of Palo Alto ( Spanish: Batalla de Palo Alto) was the first major battle of the Mexican–American War and was fought on May 8, 1846, on disputed ground five miles (8 km) from the modern-day city of Brownsville, Texas. A force of some 3,700 Mexican troops – most of the Army of The North – led by General ...Nevertheless, the Mexican-American War had far-reaching consequences for both the United States, Mexico, and the Indigenous peoples whose land both nations claimed. First among these was the. cession. of about one third of Mexico’s territory to the United States, a landmass of over 338,000,000 acres. See how a border dispute with Mexico caused it to lose nearly half of its territory to the United States. Support this channel with my Patreon!: https://www...not even sure its above 1 million residents at the time of the Mexican-American War. much less, in 1840 it had 54k and in 1850 87k, so somewhere between there. Florida didn't break 1m until the 1920s. In 1850 only New York, Pennsylvania, Ohio, Virginia, and Tennessee had over 1m people.Introduction. In 1836, Americans living in the Mexican state of Texas had rebelled against the central government in Mexico City and established the so-called Lone Star Republic. When the United States annexed Texas in 1845 and made it a new American state, the United States also inherited a long-smoldering border dispute between the breakaway ...When the war ended, the U.S. had acquired over 500,000 sq. miles of new land, including Texas and the Mexican territories that would eventually become the states of California, Arizona, New Mexico ...The Mexican War (also known as the Mexican-American War, the First American Intervention, and the U.S.–Mexican War) resulted from the annexation of Texas by the United States in 1845. Thirty-five thousand U.S. Army troops and 73,000 state volunteers fought in this war. Most volunteer regiments were from southern states, such as Louisiana, Tennessee, Missouri, and Texas. The war took place ...Treaty of Guadalupe Hidalgo Sources The Mexican-American War of 1846 to 1848 marked the first U.S. armed conflict chiefly fought on foreign soil.Jul 30, 2014 · When the war ended, the U.S. had acquired over 500,000 sq. miles of new land, including Texas and the Mexican territories that would eventually become the states of California, Arizona, New Mexico ... The siege of Fort Texas marked the beginning of active campaigning by the armies of the United States and Mexico during the Mexican–American War. The battle is sometimes called the siege of Fort Brown. [5] Major Jacob Brown, not to be confused with War of 1812 General Jacob Brown, was one of the two Americans killed in action.LA ANGOSTURA, Mexico — On the grassy, windswept hill where soldiers from north and south fought one of the most important battles of the Mexican-American War, the crunch and grind of a sand and ...Maps nos. 35, 36, 37, and 38 published separately in LC Civil War Maps (2nd ed.) under entry nos. 30, 42, 51, and 76 respectively. ... Map The Mexican War, 1846-1848 ...English: The Mexican–American War or First American Intervention – a war between Mexico and the United States (1846 to 1848). Mexico lost the war, and lost over a third of its total territory in the terms of the Treaty of Guadalupe Hidalgo. Initiated after the U.S. annexation of Texas (1845), and spreading to then Mexican New Mexico and ...Historical Map of North America & the Caribbean (13 May 1846 - Outbreak of the Mexican–American War: With the annexation of Texas, the US inherited that state's boundary dispute with Mexico. In a bid to settle the issue, as well as purchase the Mexican territories of Alta California and New Mexico, President Polk offered to pay $25 million ... The Mexican War (also known as the Mexican-American War, the First American Intervention, and the U.S.–Mexican War) resulted from the annexation of Texas by the United States in 1845. Thirty-five thousand U.S. Army troops and 73,000 state volunteers fought in this war. Most volunteer regiments were from southern states, such as Louisiana, Tennessee, Missouri, and Texas. The war took place ...A map of the campaigns of the Mexican-American War, via the US Army As expected, the US quickly moved to protect its borders. American armies would move south from the Rio Grande into Mexico and from Kansas into New Mexico Territory to take Santa Fe. After taking Santa Fe against little opposition, General Kearney headed west to California (map ...We would like to show you a description here but the site won’t allow us.When the war ended, the U.S. had acquired over 500,000 sq. miles of new land, including Texas and the Mexican territories that would eventually become the states of California, Arizona, New Mexico ...The siege of Fort Texas marked the beginning of active campaigning by the armies of the United States and Mexico during the Mexican–American War. The battle is sometimes called the siege of Fort Brown. [5] Major Jacob Brown, not to be confused with War of 1812 General Jacob Brown, was one of the two Americans killed in action.The Mexican-American War | War on Ukraine Parallel. It's probably more realistic that America would invade Mexico City from the East as that's the far easier path, but overall this is a neat concept and a very cool map! And the Spanish, the French did it twice... it's THE way to invade Mexico City.Grade Levels: 6-8, 9-12. *Click to open and customize your own copy of the Mexican-American War Lesson Plan. This lesson accompanies the BrainPOP topic Mexican-American War, and supports the standard of analyzing the causes, course, and consequences of United States westward expansion. Students demonstrate understanding through a variety of ...Slavery being spread into Mexico. This was not a cause of the Mexican-American War: 1) Shots fired from both sides along the Rio Grande River. 2) United States takes over Mexico City. 3) Santa Anna and Mexican army are defeated. 4) Treaty of Guadalupe-Hildago is signed.Mexican-American War (1846-48). The Mexican-American War was a war of national aggression to gain territory. It followed the 1845 annexation of Texas, which Mexico regarded as its territory. In 1836 the Texian Army won the Battle of San Jacinto against Mexican forces, led by famed general Santa Anna, and the Republic of Texas declared its ...Winter 1997, Vol. 29, No. 4 | Genealogy Notes By Mitchell Yockelson Part 1 of this article in the fall issue (Vol. 29, No. 3) discussed the tumult following the 1910 Mexican Revolution and American concerns over the civil war in Mexico. Pancho Villa's raid on Columbus, New Mexico, on March 9, 1916, prompted the United States to organize an expedition in retaliation. While the army prepared for ...Jun 17, 2022 · From the American Battle Monuments Commission, this site remembers soldiers from the Mexican War who are buried in the Mexico City National Cemetery. Robert E. Lee Mexican War Maps An online exhibit of 30 original military maps owned by Robert E. Lee from the holdings of the Virginia Military Institute. U.S.-Mexican War (1846-1848) Treaty of Guadalupe Hidalgo Sources The Mexican-American War of 1846 to 1848 marked the first U.S. armed conflict chiefly fought on foreign soil.Historical Map of North America & the Caribbean (13 May 1846 - Outbreak of the Mexican–American War: With the annexation of Texas, the US inherited that state's boundary dispute with Mexico. In a bid to settle the issue, as well as purchase the Mexican territories of Alta California and New Mexico, President Polk offered to pay $25 million ...The Mexican-American war in a nutshell. May marks two key anniversaries in the conflict between the United States and Mexico that set in motion the Civil War—and led to California, Texas, and eight other states joining the Union. On May 13, 1846, the United States Congress declared war on Mexico after a request from President James K. Polk.The U.S. - Mexico War (1846-1848) is the largest and most significant armed struggle between two nations in the western hemisphere. Learn more about this historical event by browsing source materials from the United States and Mexico such as proclamations, graphics, letters, and diaries from the collections of the University of Texas at Arlington.Nevertheless, the Mexican-American War had far-reaching consequences for both the United States, Mexico, and the Indigenous peoples whose land both nations claimed. First among these was the. cession. of about one third of Mexico’s territory to the United States, a landmass of over 338,000,000 acres.views 1,880,530 updated May 23 2018. Mexican War (1846–48).After weeks of fruitless diplomacy, the United States and the republic of Mexico declared war on each other in the spring of 1846. By the 1840s, many Americans held the view that the United States should reach from the Atlantic all the way to the Pacific Ocean.November 27 – December 8, 1847 – Siege of La Paz – A second Mexican attack on La Paz, Mexico, ends in an American victory. January 22 – February 14, 1848 – Siege of San José del Cabo – A failed Mexican siege of San Jose del Cabo. January – August 1848 – Mexican partisans resisted the U.S. Army of Occupation.Historical Map of North America & the Caribbean (13 May 1846 - Outbreak of the Mexican–American War: With the annexation of Texas, the US inherited that state's boundary dispute with Mexico. In a bid to settle the issue, as well as purchase the Mexican territories of Alta California and New Mexico, President Polk offered to pay $25 million ... This is a rare first-edition 1847 John Disturnell and Joseph Goldsborough Bruff map of the Mexico during the Mexican-American War (1846 - 1848). Depicting the region from Chihuahua to the Gulf of Mexico and from the Rio Grande to Mexico City, this map represents the most detailed cartography available to the United States Army at the beginning ...Grade Levels: 6-8, 9-12. *Click to open and customize your own copy of the Mexican-American War Lesson Plan. This lesson accompanies the BrainPOP topic Mexican-American War, and supports the standard of analyzing the causes, course, and consequences of United States westward expansion. Students demonstrate understanding through a variety of ...The catalyst for the Mexican-American War was the U.S. annexation of Texas on 29 December 1845. When Mexico responded by ending diplomatic relations with the U.S. government, President James K. Polk asked Congress to declare war on Mexico. Polk took advantage of the animosity between the two nations to advance a political agenda focused on Manifest Destiny (the belief that the U.S. was ...Mexican-American War Map. The conflict between the United States and Mexico in 1846-48 had its roots in the annexation of Texas and the westward thrust of American settlers. On assuming the American presidency in 1845, James K. Polk attempted to secure Mexican agreement to setting the boundary at the Rio Grande and to the sale of northern ... American forces withstand Mexican Army attacks. (A) Battle of Palo Alto. May 8. Mexican Army under Mariano Arista in the disputed land between the Rio Grande (Río Bravo) and the Nueces River engage an American army attempting to lift the aforementioned Siege of Fort Texas. (A) Battle of Resaca de la Palma.This is a rare first-edition 1847 John Disturnell and Joseph Goldsborough Bruff map of the Mexico during the Mexican-American War (1846 - 1848). Depicting the region from Chihuahua to the Gulf of Mexico and from the Rio Grande to Mexico City, this map represents the most detailed cartography available to the United States Army at the beginning ...The lesson includes a reading from Zinn’s chapter, “We Take Nothing by Conquest, Thank God.”. Here is an excerpt. Frederick Douglass wrote in his Rochester newspaper the North Star, January 21, 1848, of “the present disgraceful, cruel, and iniquitous war with our sister republic. Mexico seems a doomed victim to Anglo Saxon cupidity and ...Mexican-American War Battle Flags. Below is a an example of a Mexican-American War battle flag found in our museum collections. Description: Captain Schuyler Hamilton carried this national flag, the colors of the 1st Ohio Volunteer Infantry (O.V.I.), in the battle of Monterrey in September 1846 during the Mexican War.The Mexican War (also known as the Mexican-American War, the First American Intervention, and the U.S.–Mexican War) resulted from the annexation of Texas by the United States in 1845. Thirty-five thousand U.S. Army troops and 73,000 state volunteers fought in this war. Most volunteer regiments were from southern states, such as Louisiana, Tennessee, Missouri, and Texas. The war took place ...The U.S. - Mexico War (1846-1848) is the largest and most significant armed struggle between two nations in the western hemisphere. Learn more about this historical event by browsing source materials from the United States and Mexico such as proclamations, graphics, letters, and diaries from the collections of the University of Texas at Arlington. American forces withstand Mexican Army attacks. (A) Battle of Palo Alto. May 8. Mexican Army under Mariano Arista in the disputed land between the Rio Grande (Río Bravo) and the Nueces River engage an American army attempting to lift the aforementioned Siege of Fort Texas. (A) Battle of Resaca de la Palma.t. e. The Texas Revolution (October 2, 1835 – April 21, 1836) was a rebellion of colonists from the United States and Tejanos (Hispanic Texans) against the centralist government of Mexico in the Mexican state of Coahuila y Tejas. Although the uprising was part of a larger one, the Mexican Federalist War, that included other provinces opposed ...The catalyst for the Mexican-American War was the U.S. annexation of Texas on 29 December 1845. When Mexico responded by ending diplomatic relations with the U.S. government, President James K. Polk asked Congress to declare war on Mexico. Polk took advantage of the animosity between the two nations to advance a political agenda focused on Manifest Destiny (the belief that the U.S. was ...See how a border dispute with Mexico caused it to lose nearly half of its territory to the United States. Support this channel with my Patreon!: https://www...You are viewing an original 1847 Map of Mexico, at the time of the Mexican War . It Covers the United States southwest of Georgia and Iowa, and south of Oregon Territory . It clearly features the Republic of Texas, which was the cause of the dispute. Insets describe the battlegrounds of the 8th and the 9th, May 1846, Plan of Monterey and its ...10. It had one of the highest casualty rates of any American war. The U.S. never a lost a major battle during the Mexican-American War, but the victory still proved costly. Of the 79,000 American ...The Compromise of 1850 acted as a temporary truce on the issue of slavery, primarily addressing the status of newly acquired territory after the Mexican-American War. Under the Compromise, California was admitted to the Union as a free state; the slave trade was outlawed in Washington, D.C., a strict new Fugitive Slave Act compelled citizens of ...Mexican-American War Battle Flags. Below is a an example of a Mexican-American War battle flag found in our museum collections. Description: Captain Schuyler Hamilton carried this national flag, the colors of the 1st Ohio Volunteer Infantry (O.V.I.), in the battle of Monterrey in September 1846 during the Mexican War.The Mexican Cession ( Spanish: Cesión mexicana) is the region in the modern-day southwestern United States that Mexico originally controlled, then ceded to the United States in the Treaty of Guadalupe Hidalgo in 1848 after the Mexican–American War. This region had not been part of the areas east of the Rio Grande that had been claimed by the ... The Mexican-American War Overview Map highlights the disputed territory that caused a war between Mexico and the United States. This United States Army produced map also highlights the blockades set by the United States Military and the important military battles of the war. This map is deceiving, at a casual glance it appears to be a map of ...Nevertheless, the Mexican-American War had far-reaching consequences for both the United States, Mexico, and the Indigenous peoples whose land both nations claimed. First among these was the. cession. of about one third of Mexico’s territory to the United States, a landmass of over 338,000,000 acres. Mexican-American War. The Mexican–American War was a conflict between the United States and Mexico that began in April 1846 and ended with the signing of the Treaty of Guadalupe Hidalgo in February 1848. The war was fought mainly in what is now the southwestern United States and Mexico, and resulted in a victory for the United States.The U.S. - Mexico War (1846-1848) is the largest and most significant armed struggle between two nations in the western hemisphere. Learn more about this historical event by browsing source materials from the United States and Mexico such as proclamations, graphics, letters, and diaries from the collections of the University of Texas at Arlington.A map of the campaigns of the Mexican-American War, via the US Army As expected, the US quickly moved to protect its borders. American armies would move south from the Rio Grande into Mexico and from Kansas into New Mexico Territory to take Santa Fe. After taking Santa Fe against little opposition, General Kearney headed west to California (map ...From the American Battle Monuments Commission, this site remembers soldiers from the Mexican War who are buried in the Mexico City National Cemetery. Robert E. Lee Mexican War Maps An online exhibit of 30 original military maps owned by Robert E. Lee from the holdings of the Virginia Military Institute. U.S.-Mexican War (1846-1848)Please see the talk page for more information. (April 2019) The Battle of Cerro Gordo, or Battle of Sierra Gordo, [2] was an engagement in the Mexican–American War on April 18, 1847. The battle saw Winfield Scott 's United States troops outflank Antonio López de Santa Anna 's larger Mexican army, driving it from a strong defensive position.Show the class a map of the United States before the Mexican-American War and discuss the problems between America and Mexico regarding western lands, including Texas, prior to the war.Winter 1997, Vol. 29, No. 4 | Genealogy Notes By Mitchell Yockelson Part 1 of this article in the fall issue (Vol. 29, No. 3) discussed the tumult following the 1910 Mexican Revolution and American concerns over the civil war in Mexico. Pancho Villa's raid on Columbus, New Mexico, on March 9, 1916, prompted the United States to organize an expedition in retaliation. While the army prepared for ...Encyclopædia Britannica, Inc. When the United States annexed Texas in 1845, Mexico severed relations with its northern neighbor. U.S. President James K. Polk sent diplomat John Slidell on a secret mission to Mexico to negotiate the disputed Texas border and to purchase the New Mexico and California territories.See full list on britannica.com Historical Map of North America & the Caribbean (13 May 1846 - Outbreak of the Mexican–American War: With the annexation of Texas, the US inherited that state's boundary dispute with Mexico. In a bid to settle the issue, as well as purchase the Mexican territories of Alta California and New Mexico, President Polk offered to pay $25 million ... Incorporating a map lesson into your instruction of the Mexican-American War is a great way to reinforce and differentiate learning. The map directions require students to label and color code the following: United States, Mexico, the area in dispute, Rio Grande River, Nueces River, Pacific Ocean, and Gulf of Mexico.Jul 21, 2023 · Category:Maps of the Mexican-American War From Wikimedia Commons, the free media repository Media in category "Maps of the Mexican-American War" The following 75 files are in this category, out of 75 total. Mexican Cession.png 2,328 × 1,541; 2.81 MB 191 of 'The War with Mexico' (11030261016).jpg 1,544 × 2,593; 1.14 MB 1853–1854. The Gadsden Purchase, or Treaty, was an agreement between the United States and Mexico, finalized in 1854, in which the United States agreed to pay Mexico $10 million for a 29,670 square mile portion of Mexico that later became part of Arizona and New Mexico. Gadsden’s Purchase provided the land necessary for a southern ...In this map, the top edge of the colored area reveals the Mexico-US border in the year 1830. The difference in Mexico’s northern boundary between then and today reveals all that was lost during Santa Anna’s career, as a result of: Texan independence (Treaty of Velasco, 1836), the Mexican-American War (Treaty of Guadalupe Hidalgo, 1848), and the Treaty of Mesilla (also known as the Gadsden ...Jun 17, 2022 · From the American Battle Monuments Commission, this site remembers soldiers from the Mexican War who are buried in the Mexico City National Cemetery. Robert E. Lee Mexican War Maps An online exhibit of 30 original military maps owned by Robert E. Lee from the holdings of the Virginia Military Institute. U.S.-Mexican War (1846-1848) March, 1846. General Taylor leads troops past the Nueces River toward the Rio Grande River, through and into the land that both the U.S. and Mexico claimed as its own. April 25, 1846. The Mexican-American War begins when Mexican troops cross north of the Rio Grande River and opened fire on U.S. troops at Fort Texas. May 8, 1846.It also set the Rio Grande as the border between Mexico and the United States. America agreed to pay Mexico 15 million dollars. Mexican-American War Articles and Activities. Zachary Taylor Buchanan Biography; Mr. Polk's War - A Fictional Dialogue Between President Polk and Lincoln About Imperalism and Manifest Destiny; America in 1848 Label-me MapHistorical Map of North America & the Caribbean (13 May 1846 - Outbreak of the Mexican–American War: With the annexation of Texas, the US inherited that state's boundary dispute with Mexico. In a bid to settle the issue, as well as purchase the Mexican territories of Alta California and New Mexico, President Polk offered to pay $25 million ...This is a rare first-edition 1847 John Disturnell and Joseph Goldsborough Bruff map of the Mexico during the Mexican-American War (1846 - 1848). Depicting the region from Chihuahua to the Gulf of Mexico and from the Rio Grande to Mexico City, this map represents the most detailed cartography available to the United States Army at the beginning ...
The Annexation of Texas, the Mexican-American War, and the Treaty of Guadalupe-Hidalgo, 1845–1848. During his tenure, U.S. President James K. Polk oversaw the greatest territorial expansion of the United States to date. Polk accomplished this through the annexation of Texas in 1845, the negotiation of the Oregon Treaty with Great Britain in .... 9 2 practice solving quadratic equations by graphing answer key
10. It had one of the highest casualty rates of any American war. The U.S. never a lost a major battle during the Mexican-American War, but the victory still proved costly. Of the 79,000 American ...The Compromise of 1850 acted as a temporary truce on the issue of slavery, primarily addressing the status of newly acquired territory after the Mexican-American War. Under the Compromise, California was admitted to the Union as a free state; the slave trade was outlawed in Washington, D.C., a strict new Fugitive Slave Act compelled citizens of ...When the war ended, the U.S. had acquired over 500,000 sq. miles of new land, including Texas and the Mexican territories that would eventually become the states of California, Arizona, New Mexico ...The U.S. - Mexico War (1846-1848) is the largest and most significant armed struggle between two nations in the western hemisphere. Learn more about this historical event by browsing source materials from the United States and Mexico such as proclamations, graphics, letters, and diaries from the collections of the University of Texas at Arlington. Grade Levels: 6-8, 9-12. *Click to open and customize your own copy of the Mexican-American War Lesson Plan. This lesson accompanies the BrainPOP topic Mexican-American War, and supports the standard of analyzing the causes, course, and consequences of United States westward expansion. Students demonstrate understanding through a variety of ...Mexico Texas United States Participants: Mexico United States Major Events: Battle of Buena Vista Battle of Cerro Gordo Battle of Contreras Battle of Palo Alto Battle of Chapultepec ... (Show more) Key People: John A. Logan James K. Polk Antonio López de Santa Anna Zachary Taylor Lewis Wallace See all related content → Top QuestionsThe Compromise of 1850 acted as a temporary truce on the issue of slavery, primarily addressing the status of newly acquired territory after the Mexican-American War. Under the Compromise, California was admitted to the Union as a free state; the slave trade was outlawed in Washington, D.C., a strict new Fugitive Slave Act compelled citizens of ...Encyclopædia Britannica, Inc. When the United States annexed Texas in 1845, Mexico severed relations with its northern neighbor. U.S. President James K. Polk sent diplomat John Slidell on a secret mission to Mexico to negotiate the disputed Texas border and to purchase the New Mexico and California territories. The Mexican–American War was an armed conflict between the United States and Mexico from 1846 to 1848. It followed the 1845 U.S. annexation of Texas, which Mexico considered Mexican territory because it did not recognize the Velasco treaty signed by Mexican General Antonio López de Santa Anna when he was a prisoner of the Texian Army during the 1836 Texas Revolution.Map of the Battle of Resaca de la Palma - May 9, 1846. Reference Maps on the Aftermath of the Mexican-American War 1846-1848. Fourteen Maps of the United States: Territorial Growth 1775-1970. Three Maps of the United States: Expansion 1783-1854. Map of the Expansion of the United States 1783-1907. Four Maps of the Organization of Territories in ...The Pancho Villa Expedition—now known officially in the United States as the Mexican Expedition, but originally referred to as the "Punitive Expedition, U.S. Army" —was a military operation conducted by the United States Army against the paramilitary forces of Mexican revolutionary Francisco "Pancho" Villa from March 14, 1916, to February 7, 1917, during the Mexican Revolution of 1910–1920.The Mexican-American War Maps This map shows some of the major battles and campaigns during the Mexican-American War. This image was created by Kaidor in 2012. This image is courtesy of Wikimedia Commons.The Annexation of Texas, the Mexican-American War, and the Treaty of Guadalupe-Hidalgo, 1845–1848. During his tenure, U.S. President James K. Polk oversaw the greatest territorial expansion of the United States to date. Polk accomplished this through the annexation of Texas in 1845, the negotiation of the Oregon Treaty with Great Britain in ...Mexican-American War. The Mexican–American War was a conflict between the United States and Mexico that began in April 1846 and ended with the signing of the Treaty of Guadalupe Hidalgo in February 1848. The war was fought mainly in what is now the southwestern United States and Mexico, and resulted in a victory for the United States..