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The United States Capitol officially changes locations from Philadelphia to Washington D.C.
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Thomas Jefferson is elected the third president of the United States.
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A group of volunteers and soldiers set out across the United States to explore the Louisiana Territory.
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The Louisiana Territory is purchased by the U.S. from Napoleon.
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The United States declares war upon great Britain in response to British aggravation of Indians and sailor impressment.
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A compromise is made to maintain the balance of free states to slave states. Missouri and Maine are admitted to the Union.
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General Andrew Jackson is elected as the seventh president of the U.S.
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Texas joins the union, making it the 28th state to become part of the U.S.
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The Confederacy and the Union go to war against each over slavery and other issues.
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President Lincoln issues the "Emancipation Proclamation" which frees all slaves in the U.S.