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Manifest Destiny. Expansionism and Imperialism | US-Mexican War

Manifest Destiny. Expansionism and Imperialism. The United States experienced its most rapid territorial growth during the mid-1840s. The nation annexed Texas in 1845, acquired Oregon south of 49 degrees north latitude in a treaty with Great Britain in 1846, and conquered and held California and New Mexico during the U.S.-Mexican War.

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PBS Learning Media

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