Answer:
ОА.
A territory that was free soil was closed to slavery, while one that had popular sovereignty was allowed to vote on the slavery issue.
Explanation:
Popular Sovereignty was an idea first formulated Lewis Cass, and later championed by Stephen Douglas. A good idea in principle, that stated a territory's right to pick to be a slave or free states, this solution was favored by political moderates. Free Soil politicians wanted incoming American territories to be free.
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