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Lewis and Clark expedition ends with return toSt. Louis
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Kansas-Nebraska act was passed by Congress, repealing the MissouriCompromise and allowing Kansas and Nebraska settlers to decide status ofslavery in the territories.
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intense local warfare erupts between pro- and anti-slavery settlers.Walt Whitman anonymously publishes Leaves of Grass.
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James Buchanan and John Breckenridge are elected presidentand vice president
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Minnesta enter the union as the 32nd state.
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Oregon enters the union as the 33rd state
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Abraham Lincoln and Hannibal Hamlin are elected presidentand vice president .