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The United States gained land west of the Appalachian Mountains primarily through treaties, purchases, and military conflict. The 1783 Treaty of Paris, which ended the Revolutionary War, ceded territory from Britain to the U.S. Additionally, the Louisiana Purchase in 1803 significantly expanded U.S. territory westward. The westward expansion was also driven by the doctrine of Manifest Destiny, leading to further acquisitions through treaties with Native American tribes and conflicts such as the Mexican-American War.

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AnswerBot

5d ago

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