The original advocate of organizing new territories on the basis of "popular sovereignty" was

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Lewis Cass was the original advocate of the idea of "popular sovereignty," which proposed that the decision on whether to allow slavery in new territories should be made by the people who settled there, rather than by Congress. This concept was a key issue in the debates over the expansion of slavery in the United States in the mid-19th century.

The Original Advocate of Organizing New Territories on the Basis