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The '''Mexican War''', or '''Mexican-American War'''<ref> In Mexico it is called '''''la intervención norteamericana''''' (the North American Intervention or '''''la guerra del 47''''' (the War of '47)</ref>,  was a major war between the [[United States]] and [[Mexico]] from 1846 to 1848, in response to the U. S. [[Texas Annexation|annexation]] of [[Texas]] in 1845.

The '''Mexican War''', or '''Mexican-American War'''<ref> In Mexico it is called '''''la intervención norteamericana''''' (the North American Intervention ([Though in that context 'intervention' is synonymous with 'invasion') or '''''la guerra del 47''''' (the War of '47)</ref>,  was a major war between the [[United States]] and [[Mexico]] from 1846 to 1848, in response to the U. S. [[Texas Annexation|annexation]] of [[Texas]] in 1845.

Pushed by Democrats, especially newly elected President [[James K. Polk]] and outgoing President [[John Tyler]], Congress on March 1, 1845, jointly resolved to admit the independent Reopublic of Texas into the Union as a state. Whigs generally were opposed, Mexico had long warned that annexation meant war, and brushing aside American offers to negotiate  and British offers to mediate, the Mexican government promptly broke off diplomatic relations and sent troops into the disputed region claimned by both Mexico and the Republic of Texas, and now claimed by the United States. Polk ordered General Zachary Taylor to move U.S. Army forces to a point "on or near" the Rio Grande to repel any invasion from Mexico.

Pushed by Democrats, especially newly elected President [[James K. Polk]] and outgoing President [[John Tyler]], Congress on March 1, 1845, jointly resolved to admit the independent Reopublic of Texas into the Union as a state. Whigs generally were opposed, Mexico had long warned that annexation meant war, and brushing aside American offers to negotiate  and British offers to mediate, the Mexican government promptly broke off diplomatic relations and sent troops into the disputed region claimned by both Mexico and the Republic of Texas, and now claimed by the United States. Polk ordered General Zachary Taylor to move U.S. Army forces to a point "on or near" the Rio Grande to repel any invasion from Mexico.