Answer: “The citizens of Kansas voting to allow slavery”
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Step-by-step explanation:
This best describes the cause for the chain of events known as Bleeding Kansas. In 1854, Congress passed the Kansas-Nebraska Act, which allowed the settlers in the territories of Kansas and Nebraska to decide for themselves whether to allow slavery. This led to a rush of pro-slavery and anti-slavery settlers into Kansas, with both sides seeking to gain control of the territory. The resulting conflict and violence became known as Bleeding Kansas.