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U.S. forces invaded Mexico in 1846, claiming nearly half of Mexico’s territory for the United States. Here, General Scott enters Mexico City with his troops.

Prints and Photographs Division, Library of Congress

U.S. forces invaded Mexico in 1846

Images of the Era: 1815-1851

Following the War of 1812, a stronger sense of national unity emerged in the United States. As America expanded westward, however, attempts to spread slavery into those new territories seriously divided the nation.