In 1858, during the Lincoln-Douglas debates, Abraham Lincoln publicly agreed with the following proposals:
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Allow slavery where it already existed - Lincoln believed in not interfering with slavery in states where it was already established.
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Prohibit slavery in the territories - Lincoln advocated for the prohibition of slavery in the territories.
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Rely on popular sovereignty to resolve questions about slavery - While Lincoln disagreed with popular sovereignty as a principle, he recognized it as part of the prevailing political debate at the time.
So, the correct choices based on Lincoln's public positions at the time are:
- Allow slavery where it already existed
- Prohibit slavery in the territories
(Note: Lincoln did not call for the immediate abolition of slavery in every U.S. state and territory at that time, so that option would not be selected.)