Final answer:
The Kansas-Nebraska Act of 1854 nullified the Missouri Compromise and intensified tensions between pro and anti-slavery factions, leading to violent conflicts like 'Bloody Kansas.'
Explanation:
The Kansas-Nebraska Act was a critical piece of legislation passed in 1854 that effectively nullified the Missouri Compromise, allowing for the possibility of slavery in new territories. This act intensified the tensions between pro-slavery and anti-slavery factions, leading to violent conflicts like 'Bloody Kansas.'
The Kansas-Nebraska Act pleased southerners seeking federal protection for slavery but angered northerners opposing its spread to new territories. The act's repeal of the Missouri Compromise line was a significant turning point in the lead-up to the Civil War.
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