Why was a national law against slavery needed after 1863 even though the Emancipation Proclamation had been issued?

The Emancipation Proclamation declared enslaved people free in areas rebelling against the United States, but it did not end slavery everywhere in the country. A national law was needed to abolish slavery throughout the United States, including places not covered by the proclamation. So the correct choice is “The proclamation only applied to the Confederacy.”

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