<span>Montgomery Bus Boycott</span>
In 1854, the Missouri Compromise was repealed by the Kansas-Nebraska Act.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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Answer: B
It demonstrates that disputes over slavery consistently caused regional friction during the 18th and 19th centuries.
Explanation: Ap*x
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