Through the Mexican War, the United States expanded its territory to the south, and all the way to the west coast of California.
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|The United States and Mexico disagreed over the border between the countries. Mexico never recognized Texas as a separate territory, and the United States wanted Texas as a U.S. territory. In May, 1846, the United States declared war on Mexico.|
|The United States armies led by General Zachary Taylor, General Winfield Scott and Captain Fremont eventually defeated the Mexican army led by Antonio Lopez de Santa Anna.|
|As a result of the war, Mexico agreed to the Rio Grande River as the boundary between Texas and Mexico. Mexico also gave the United States the land consisting of California, Nevada, Utah and part of Arizona.|