The difference is that free-soil territories did not allow slavery, while those with popular sovereignty enabled residents to decide the status of slavery through voting.
The difference between the free-soil territories and those that had popular sovereignty lies in their approach to slavery. A territory that was free soil was closed to slavery, while one that had popular sovereignty allowed the residents to determine the status of slavery through voting. On the other hand, a territory that had popular sovereignty meant that the residents could vote on the slavery issue themselves.
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