why did the united states fight a war with mexico

It did not take long before the United States and Mexico went to war. James K. Polk for having “unnecessarily and unconstitutionally” initiated the war. Mexican-American War: Treaty of Guadalupe Hidalgo, 10 Civil War Generals Who Served in the Mexican-American War, American Civil War: Major General George H. Thomas, The Battle of Chapultepec in the Mexican-American War, Mexican-American War: Battle of Cerro Gordo, Mexican-American War: Battle of Molino del Rey, Mexican-American War: Battle of Chapultepec. The Mexicans had decent artillery, including the legendary St. Patrick's Battalion, but the Americans had the best in the world at the time. Let your life be a counter friction to stop the machine. & E.C. The war with the U.S. was certainly Mexico's biggest problem in 1847…but it wasn't the only one. Why? The United States had long argued that the Rio Grande was the border between Mexico and the United States, and at the end of the Texas war for independence Santa Anna had been pressured to agree. “The late 1930s was a time of increasing tensions between Mexico and the United States on the diplomatic front, largely tied to the nationalization of oil,” says Moni… Polk claimed that invading Mexicans had “shed American blood on American soil,” and the congressman and future president Abraham Lincoln introduced the “Spot Resolutions” in an attempt to determine precisely where the initial conflict between U.S. and Mexican troops had occurred and whether it “was, or was not, our own soil at that time.”. This advance in artillery strategy greatly helped the American war effort. Mexican-American War, also called Mexican War, Spanish Guerra de 1847 or Guerra de Estados Unidos a Mexico (“War of the United States Against Mexico”), war between the United States and Mexico (April 1846–February 1848) stemming from the United States’ annexation of Texas in 1845 and from a dispute over whether Texas ended at the Nueces River (Mexican claim) or the Rio Grande (U.S. claim). The issue that brought the conflict to open war was which river should be the border between Texas and Mexico. By late 1847, the Americans had captured Mexico City, which made the Mexicans agree to a peace treaty which ceded all of the lands the U.S. had wanted. The Presidency of Mexico changed hands several times during the Mexican-American War. These men often differed ideologically from their predecessors and successors, making any kind of continuity impossible. Mexico, however, refused to be bound by Santa Anna’s promises and insisted the border lay farther north, at the Nueces River. As long as Texas was an independent republic there was a chance that Texas would again become part of Mexico, which had a better legal claim to Texas than the United States. General Zachary Taylor, a hero of the war, used his newfound notoriety to become the twelfth president of the U.S. Mexico ceded to the United States nearly all of the territory now included in the states of New Mexico, Utah, Nevada, Arizona, California, Texas, and western Colorado in exchange for $15 million. On May 9, 1846, Polk began to prepare a war message to Congress, justifying hostilities on the grounds of Mexican refusal to pay U.S. claims and refusal to negotiate with Slidell. From 1846 to 1848, the United States of America and Mexico fought the Mexican-American War. The American invasion from the north was led by General Zachary Taylor, who would later become President of the United States. An attack on American troops by Mexican soldiers in the disputed area between the two rivers on April 25, 1846. When Polk learned of the snub, he ordered troops under Gen. Zachary Taylor to occupy the disputed area between the Nueces and the Rio Grande (January 1846). When U.S. diplomatic efforts to establish agreement on the Texas-Mexico border and to purchase Mexico’s California and New Mexico territories failed, expansionist U.S. Pres. It stemmed from the United States' annexation of Texas in 1845 and from a dispute over whether Texas ended at the Nueces River (Me… Mexico also had enormous debts and no money in the treasury to pay them. A second invasion came from the north through Texas. Christopher Minster, Ph.D., is a professor at the ​Universidad San Francisco de Quito in Ecuador. Except for the first battles fought in a disputed border area, all of the fighting took place in Mexico. The Americans confidently anticipated victory, while the Mexicans—imagining the United States was too internally divided to fight effectively and that Great Britain might intervene in favor of Mexico—also expected to win the war. Politicians, Generals and other would-be leaders fought for power, making alliances and stabbing one another in the back. A relatively small expedition was sent to secure the desired western territories: it soon conquered California and the rest of the current U.S. southwest. The United States won the first battles of the war, but Mexico did not surrender as Polk had anticipated. History >> Westward Expansion The Mexican-American War was fought between the United States and Mexico from 1846 to 1848. Zachary Taylor attacked the main Mexican force from the north with a second army. At the time of the war, Mexico had just fought with Spain and they did not have enough resources to fight the Americans (Mills and Bowman xiv). To fight Mexico, the United States had to mobilize, equip, and transport a large force, including both army and navy components. The cartels and the drug trade fuel rampant violence in Mexico, contributing to its tens of thousands of homicides every year. By early 1848 it was an easy decision to make peace with the Americans: it was the easiest of the problems to solve, and the Americans were also willing to give Mexico $15 million as part of the Treaty of Guadalupe Hidalgo. The war broke out in Europe in August 1914 as the Mexican Revolution was in the midst of full-scale civil war between factions that had helped oust General Victoriano Huerta from the presidency earlier that year. Omissions? In the face of such chaos, troops were rarely paid or given what they needed to win, such as ammunition. On Monday, he pivoted back to his trade fight with China and vowed to … The soldiers had good guns and uniforms, enough food, high-quality artillery and horses and just about everything else they needed. Would you have sided with those who opposed war with Mexico or those who supported it? Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Mexican politics was extremely chaotic at that time. Also, the Americans first deployed the "flying artillery" in this war: relatively lightweight but deadly cannons and mortars that could be swiftly redeployed to different parts of the battlefield as needed. The Americans were outnumbered in nearly every battle they fought. Yet, today, it … The concept of Manifest Destiny held that the United States had the providential right to expand to the Pacific Ocean. Principally at issue was where the encounter had actually taken place and the willingness of Americans to acknowledge the Mexican contention that the Nueces River formed the border between the two countries. Why did the United States declare war on Mexico? He sent one army under Stephen Kearny to capture New Mexico and then march on to California. All three thrusts succeeded. That evening he received word that Mexican troops had crossed the Rio Grande on April 25 and attacked Taylor’s troops, killing or injuring 16 of them. From 1846 to 1848, the United States of America and Mexico went to war. The war—in which U.S. forces were consistently victorious—resulted in the United States’ acquisition of more than 500,000 square miles (1,300,000 square km) of Mexican territory extending westward from the Rio Grande to the Pacific Ocean. Further, legislators were at odds over whether Polk had the right to unilaterally declare that a state of war existed. Let us know if you have suggestions to improve this article (requires login). Beauregard, George Pickett, James Longstreet, Stonewall Jackson, George McClellan, George Meade, Joseph Johnston, and others. Get a Britannica Premium subscription and gain access to exclusive content. "Loans" were forced from the rich and the church, but still corruption was rampant and the soldiers were poorly equipped and trained. The Mexican-American War reopened the slavery-extension issue, which divided the North and South and which had been largely dormant since the Missouri Compromise. The Wilmot Proviso—banning slavery from any territory acquired from Mexico—was never passed, but it led to acrimonious debate and contributed greatly to the rising sectional antagonism. Concurrently, the administration-controlled newspaper, the Washington Union, stated that resistance by Mexico would result in an invasion and occupation by U.S. troops.When Mexico refused to sell, Polk began to prepare a declaration of war, but before its completion he learned that Mexican forces had killed or wounded 16 U.S. soldiers in the disputed territory. On February 2, 1848, the United States and Mexico signed a peace treaty. He liked to attack where he was least expected and more than once surprised his opponents by coming at them from seemingly out of nowhere. José Joaquín Herrera, aware in advance of Slidell’s intention of dismembering the country, refused to receive him. In January 1847 the by-then Whig-controlled House voted 85 to 81 to censure Polk for having “unnecessarily and unconstitutionally” initiated war with Mexico. Mexico agreed to give up California and New Mexico. Patrick’s Battalion, a unit of the Mexican Army, was composed of mainly of Irish Catholic immigrants who deserted the U.S. Army and fled to Mexico during the war, which lasted from 1846-48. Whatever Texas does, Mexico cannot have a stake in it. Mexican-American War, also called Mexican War, Spanish Guerra de 1847 or Guerra de Estados Unidos a Mexico (“War of the United States Against Mexico”), war between the United States and Mexico (April 1846–February 1848) stemming from the United States’ annexation of Texas in 1845 and from a dispute over whether Texas ended at the Nueces River (Mexican claim) or the Rio Grande (U.S. claim). Regional leaders, such as governors, often refused to send any aid at all to the central government, in some cases because they had serious problems of their own at home. Most of the opposition came from the northern states. There were several reasons why they did so, but the most important ones were the U.S. annexation of Texas and the Americans' desire for California and other Mexican territories. However little did Mexico know, such acts were a violation of the fundamental principles of international law, and moreover United States began to threaten Mexico’s territorial security. Some "administrations" lasted only days. The Americans invaded on three fronts. The entire war was fought on Mexican soil, which should have given the Mexicans an advantage. Won by the Americans and damned by its contemporary critics as expansionist, it resulted in the U.S. gaining more than 500,000 square miles (1,300,000 square km) of Mexican territory extending westward from the Rio Grande to the Pacific Ocean. The Americans believed their nation should extend to the Pacific: this belief was called "Manifest Destiny.". Mexico was a neutral country in World War I, which lasted from 1914 to 1918. In 1938, Mexico’s reformist president, Lázaro Cárdenas, nationalized the country’s oil industry, which angered powerful U.S. oil companies. Battles were hard and marches long. of such a nature that it requires you to be the agent of injustice to another, then, I say, break the law. The Mexican-American War was the first in which officers trained at the West Point Military Academy saw serious action. A third landed near Veracruz and fought its way inland. The Philippine Fight for Independence. The conflict pitted many Catholic immigrants to America against a largely Catholic Mexico and these soldiers had switched sides, joining Mexican forces in the fight against the United States. The Unites States annexation of Texas in 1845. If Mexico's generals were bad, their politicians were worse. Taylor was an excellent strategist: when faced with the imposingly fortified city of Monterrey, he saw its weakness right away: the fortified points of the city were too far from one another: his battle plan was to pick them off one by one. More than one battle turned on the actions of a brave Captain or Major. The war took the lives of at least 25,000 Mexicans and nearly 14,000 U.S. soldiers. Once Mexico showed aggression to Texas, the United States had a right to go to war with Mexico because Texas was an independent republic and wanted to be annexed into the United States. Please select which sections you would like to print: Corrections? War had by this time become inevitable, and indeed it was popular on both sides of the border. The Texans, however, began to disagree with the government of Mexico. There were many causes of the war, but the biggest reasons were Mexico's lingering resentment over the loss of Texas and the Americans' desire for Mexico's western lands, … Ultimately, the House did not act on Lincoln’s resolutions, and Polk remained steadfast in his claim that the conflict was a just war. Time and again, these men proved the value of their education and skill. Thousands were killed and by 1847 the major cities were under siege. Abraham Lincoln's criticism of the war led to comparisons between him and Benedict Arnold, a traitor against the U.S. during the American Revolutionary War. But why did the U.S. win? First, the desire of the U.S. to expand across the North American continent to the Pacific Ocean caused conflict with all of its neighbors; from the British in Canada and Oregon to the Mexicans in the southwest and, of course, with the Native Americans. Border disputes and Mexican attacked U.S. forces. Most Whigs viewed Polk’s motives as conscienceless land grabbing. Mexico's leaders were unable to unite even in the face of a common enemy battling its way across Mexico. The American government committed plenty of cash to the war effort. And, Mexico would … The second American army, attacking from the east, was led by General Winfield Scott, probably the best tactical General of his generation. The worst was in the Yucatán, where indigenous communities which had been repressed for centuries took up arms in the knowledge that the Mexican army was hundreds of miles away. The actions of the President of the United States have a profound impact on America's foreign relations. Generals removed politicians from power and vice-versa. Congress overwhelmingly approved a declaration of war on May 13, but the United States entered the war divided. Democrats, especially those in the Southwest, strongly favoured the conflict. American cannon crews had roughly double the effective range of their Mexican counterparts and their deadly, accurate fire made the difference in several battles, most notably the Battle of Palo Alto. In addition to small units sent to California and New Mexico, the United States sent two major armies into Mexico under the commands of General Winfield Scott and future President of the United States General Zachary Taylor.. After the U.S. had entered Mexico, the Mexican general Antonio López de Santa Anna took command of the Mexican soldiers in early 1847. Gold was found in California only days before the United States obtained it through the Treaty of Guadalupe Hidalgo. It basically said, “If you want to, we will help you in the effort of helping you regain some of your lost territories from the United States. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The armies sent to Mexico were relatively small, peaking at about 8,500 soldiers. As the first rumblings of another great war stirred in Europe in the 1930s, Mexico and the United States seemed like unlikely allies. Kellogg (Firm)/Wikimedia Commons/Public Domain, From 1846 to 1848, the United States of America and Mexico fought the Mexican-American War. Most Whigs, however, viewed the war as conscienceless land grabbing, and the Whig-controlled House voted 85 to 81 to censure Democratic Pres. Premonitions of the Mexican-American War can actually be found in the lame duck days of President Tyler's administration. Commodore John D. Sloat assaulted California from the sea. In his quickly revised war message—delivered to Congress on May 11—Polk claimed that Mexico had “invaded our territory and shed American blood on American soil.”. Among the most-aggressive challenges to the legitimacy of Polk’s casus belli was that offered by future president Abraham Lincoln, then a first-term member of the House of Representatives from Illinois. The Mexican War, instigated over a border dispute between the U.S. and Mexico, culminated with huge territorial gains for the United States. At the outbreak, the U.S. had only a small amount of troops in the Philippines compared to Aquinaldo’s 40,000 fighters. Under the Treaty of Guadalupe Hidalgo, which settled the Mexican-American War, the United States gained more than 500,000 square miles (1,300,000 square km) of land, expanding U.S. territory by about one-third. What was General Scott's strategy for winning the war with Mexico? The United States invaded and occupied Mexico City. General Santa Anna and General Gabriel Victoria hated one another so badly that at the Battle of Contreras, Victoria purposely left a hole in Santa Anna's defenses, hoping the Americans would exploit it and make Santa Anna look bad: Santa Anna returned the favor by not coming to Victoria's aid when the Americans attacked his position. If that is true, then America did have the right to declare war. Mexican-American War - Mexican-American War - Invasion and war: When war broke out, former Mexican president and general Antonio López de Santa Anna (the vanquisher of the Texan forces at the Alamo in 1836) contacted Polk. In September 1969, U.S. President Richard Nixon declares a “war on drugs” and the United States launches an aggressive search-and-seizure counternarcotics operation on the U.S.-Mexico border. The fighting Edit. In 1845 the U.S. annexed the Republic of Texas, which had won de facto independence from Mexico in the Texas Revolution (1835–36). Proclamation by President James Polk printed in a leaflet declaring the United States to be at war with Mexico, printed in 1846. Democrats, especially those in the Southwest, strongly favoured the Mexican-American War. Indeed, from the outset, Whigs in both the Senate and the House challenged the veracity of Polk’s assertion that the initial conflict between U.S. and Mexican forces had taken place in U.S. territory. In September U.S. Pres. E.B. In the face of the chaos in Mexico City, small rebellions were breaking out all over Mexico. Polk did no such thing and Mexico declared that the annexation was an act of war. ...The Mexican - American War was a war between the United States and Mexico which lasted from April 1846 to February 1848. Advance in artillery strategy greatly helped the American government committed plenty of cash to the war with Mexico inland! 1846 to February 1848 foreign relations a military alliance between Germany, Mexico not... 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