Manifest destiny was the idea that the United States possessed a God-given right to expand its territory from the Atlantic Ocean to the Pacific Ocean. Some proponents of the idea even suggested that the country should absorb Canada, Mexico, and the nations of Central America and the Caribbean. The concept justified rapidly expanding white settlement throughout the mid- and late 19th century.
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Manifest Destiny and Mexico

Expansion and Reform, 1790-1850
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Manifest Destiny and Slavery

Civil War and Reconstruction, 1840-1877
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Settlement of the West

Annexation of Texas