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The capital was moved from Philadelphia to Washington D.C.
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Thomas Jefferson is inaugurated as the third president of the United States.
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Lewis and Clark set out on a mission to explore the west and find a route to the Pacific Ocean.
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U.S. declares war on Britain after the British interfered with American shipping and westward expansion.
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Maine is admitted as a free state so that Missouri can be admitted as a slave state.
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The Continental Congress accepts the Articles of Confederation as the first U.S. Constitution.
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Texas declares its independence from Mexico.
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Gold is discovered at Sutter's Mill in California.