17 h 5 m, 8 maio 1820 ano - Missouri Compromise

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In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state. ... In 1854, the Missouri Compromise was repealed by the Kansas Nebraska Act. https://en.m.wikipedia.org/wiki/Missouri_Compromise

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