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Why was Douglas's proposal of popular sovereignty in Nebraska an issue for both Northerners and Southerners?
Nebraska lay north of the Missouri Compromise line where slavery was legally closed. He assumed the territory would be admitted as 2 states, one free and one slave, which would maintain a congressional balance in the Senate, but he needed to support the repeal of the Missouri Compromise which would make slavery legal again north of the line. This created a great storm in Congress.