| 1 | 1846 | - 25 Apr 1846—2 Feb 1848: Mexican-American War
The war was fought over the northern territories of Mexico and Texas. The United States conquered California, New Mexico, parts of northern Mexico and Mexico City which forced Mexico to sell the territories for 15 million dollars in the Treaty of Guadalupe Hidalgo. Mexico also accepted the loss of Texas with the Rio Grande as its northern border.
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1821 - 1858 (36 years)