Who came up with the missouri compromise and how long did the compromise last?

In 1854, the Missouri Compromise was repealed by the Kansas-Nebraska Act. Three years later the Missouri Compromise was declared unconstitutional by the Supreme Court in the Dred Scott decision, which ruled that Congress did not have the authority to prohibit slavery in the territories.

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Henry Clay, the act helped hold the Union together for more than thirty years. It was repealed by the Kansas-Nebraska Act of 1854.

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