The Emancipation Proclamation succeeded in freeing enslaved people in

South there were no slaves in the north if there were they were considered free as long as they had their papers.

Explanation:

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The answer for this is "Compromise of 1850". 

The Compromise of 1850 is a set of laws dealing with the issue of slavery. California was admitted as a free state, upsetting the groups in favor of slavery and satisfying those opposing it in the U.S senate. In Addition, California abolished the slave trade by entering the Union as a free (no slavery) state.