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The country's capital is moved from Philadelphia to Washington, DC.
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Thomas Jefferson is inaugurated as the third President in Washington, DC.
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The United States paid 15 million to France for the Louisiana territory, which compromised 830,000 sq miles, doubling the United States size.
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James Madison is elected as the fourth President.
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In the war of 1812, the British capture and burn the White House and the Capital.
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The Missouri Compromise, a compromise to help maintain balance between free states and slave states, is admitted. Maine is admitted as a free states, and Missouri is a slave state, but slavery is prohibited in states in the new Louisiana Territory from being a slave state north of the 36,30' latitude.
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Continental Congress adopts the Articles of Confederation, the first U.S. constitution.
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In his annual address to Congress, President Monroe declares that the American continents are henceforth off-limits for further colonization by European powers.
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John Quincy Adams is inaugurated as the sixth president.
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The U.S. Constitution goes into effect, having been ratified by nine states.
