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Answer: C. the proposal that the Nebraska Territory would decide for itself whether to allow slavery.
Explanation:
The concept of popular sovereignty states that only the residents of the territory can choose whether or not slavery is allowed.
The Kansas-Nebraska Act (1854), proposed by Stephen A. Douglas, stated popular sovereignty to recognize the settlers´ right to make that decision within the new state. This act raised rather than reduced sectional conflicts, leading to Bleeding Kansas, a period of violence foregoing the American Civil War.
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