Stephen A.Douglas argued in his Freeport Doctrine during the Lincoln-Douglas debates that

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During the Lincoln-Douglas debates, Stephen A. Douglas argued in his Freeport Doctrine that action by territorial legislatures could keep slavery out of the territories despite the Dred Scott decision. This argument later became known as popular sovereignty, which allowed states to determine whether they wanted to allow slavery or not. This position was influential in the lead-up to the Civil War.

Stephen ADouglas Argued in His Freeport Doctrine During the Lincoln-Douglas Debates