In 1846, the United States and Mexico fought a war. Two years passed throughout the war. Mexico would lose nearly half of its territory to the United States by the end of the conflict, including areas from Texas to California.
Because it covered territory from the Atlantic to the Pacific, the war was a significant moment in American history as it fulfilled its "manifest destiny".
America was struck by the notion of "manifest destiny" in the 1840s, which held that the nation should extend from the Atlantic to the Pacific Ocean. The Oregon Territory, which was shared by the United States and Great Britain, and Mexico's western and southern holdings stood in the way of America's efforts to do this.
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