Answer:
After the Kansas-Nebraska Act reopened the possibility of slavery extending into new territories, tensions between pro- and anti-slavery advocates erupted into violence.
Radical abolitionists, like John Brown, attacked and murdered white southerners in protest. A pro-slavery US Senator, Preston Brooks, viciously beat abolitionist Senator Charles Sumner on the floor of the Senate.
Bleeding Kansas foreshadowed the violence that would ensue over the future of slavery during the Civil War.
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