U.S. Territorial Expansion and Key Events

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Treaty of Guadalupe Hidalgo

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Ended war with Mexico and gave the U.S. the Mexican Cession.

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Mexican Cession

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Acquired in Treaty of Guadalupe Hidalgo following U.S.-Mexican War, $15 million to Mexico for New Mexico, Arizona, Nevada, Utah, Colorado, Wyoming, and California.

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Louisiana Purchase

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1803, Jefferson paid France $15 million, doubled the size of the U.S.

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Adams-Onis Treaty

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1819, Spain sold Florida to U.S. for $5 million, U.S. recognized Spanish control of Texas.

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Transcontinental Railroad

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Encouraged settlement of the West; opened new markets to sell goods; prices decreased; built by Irish and Chinese immigrants.

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Oregon Territory

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1846 - acquired through treaty with Britain; accomplished Manifest Destiny.

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Manifest Destiny

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Belief that the United States should own all of the land between the Atlantic and Pacific Oceans.

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Gadsden Purchase

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Land purchased to complete a southern transcontinental railroad and completed the acquisition of land that makes up the present-day U.S.

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U.S. - Mexican War

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(1846-1848) between U.S. and Mexico resulted in America gaining Mexican Cession (California, Arizona, New Mexico, Nevada, Utah, and Colorado).

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California Gold Rush

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1849 - population increased; Chinese immigrants came to the U.S. and later worked on Transcontinental Railroad and faced discrimination.