Of all our country's major military conflicts, the Mexican War is perhaps the least known. It has been long overshadowed by the later Civil War, and is still today frequently confused with the Texas Revolution of 1835-1836, the Spanish-American War (1898), or the Mexican intervention and border troubles of 1914-1916.
This history of this war begins in the early 1800s. At this time, the United States of
America consisted of a union of twenty-four sovereign states.
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most of his instructions. The U.S.
Senate reluctantly approved the treaty.
Under the treaty, Mexico ceded to the United States Upper California and New
Mexico (including Arizona) and recognized U.S. claims over Texas, with the Rio
Grande as its southern boundary. The United States in turn paid Mexico $15,000,000,
assumed the claims of American citizens against Mexico, recognized prior land grants
in the Southwest, and offered citizenship to any Mexicans residing in the area.