Which statement regarding "Bleeding Kansas" is correct?

Question

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"Bleeding Kansas" was a violent political confrontation between pro-slavery and anti-slavery forces in Kansas in the mid-1850s. Both sides engaged in acts of violence, including raids, arson, and murder. The conflict was sparked by the Kansas-Nebraska Act, which allowed settlers in the newly created territories to vote on whether to allow slavery. The fighting in Kansas foreshadowed the larger conflict that would erupt in the Civil War. While there were casualties, the number of deaths is estimated to be far lower than 5,000.

Which Statement Regarding "Bleeding Kansas" Is Correct