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The signing of the Treaty of Paris, in which the British recognized The United States as it's own country, and ceased war between the two countrys.
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The only planned city is created.
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The cotton gin is invented.
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The treaty that resolved problems remaining from the Revolutionary War between the British and U.S. citizens.
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The purchase of a large amount of land from the French, who sold it to The United States for less than three cents an acre.
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The journey of Meriwether Lewis and William Clark from the Mississipi River to the Pacific Ocean and back.
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Increased trading.
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The road built to connect all of the United States.
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Spain sold Florida to The U.S.