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Secession, in U.S. history, withdrawal of the Southern states from the Federal Union, 1860–1. A right of secession, arising from a states' rights interpretation of the Constitution, was claimed in the early 19th century by the defeated Federalist Party in New England. The concept died in the United States when the Civil War ended in the Southern states' defeat.

See also: Civil War, U.S.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Sato, Eisaku to Serra, Junípero