The Mexican-American War lasted from 1846 until 1848. It grew out of unresolved border disputes between the Republic of Texas and Mexico after the independence of the former during the Texas Revolution of 1836. Texas was admited into the United States on 1845 and as a consequence tension with Mexico increased over the disputed border.

The U.S. Congress declared war on May 13, 1846, while Mexico did so on May 23. Most of the formal fighting effectively ended on October, 1847, soon after the fall of Mexico City. The Treaty of Guadalupe Hidalgo was signed on February 2, 1848 in which Mexico surrendered a vast tract of land to the United States for the sum of USD $15 million.

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