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Thomas Jefferson becomes president
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U.S. negotiates Louisiana Purchase from France: for $15 million, U.S. doubles its domain, increasing its territory by 827,000 sq mi, from Mississippi River to Rockies and from Gulf of Mexico to British North America.
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Robert Fulton makes first successful steamboat trip on Clermont between New York City and Albany.
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Missouri admitted as slave state but slavery barred in rest of Louisiana Purchase
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U.S. Monroe Doctrine warns European nations not to interfere in Western Hemisphere.
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Slavery Abolished in British Empire
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Supreme Court, in Dred Scott decision, rules that a slave is not a citizen. Financial crisis in Europe and U.S. Great Mutiny
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South Carolina secedes from the Union.
