Answer:
All enslaved people in the states that were rebelling
Step-by-step explanation:
Lincoln's Emancipation Proclamation basically declared that all contraband of the Confederates would be confiscated. This encouraged slaves in the Confederates to flee to the Union and become liberated. However, slaves states in the Union that bordered the Confederates (like Kentucky and Tennessee) were allowed to keep their slaves. Lincoln did not want to lose any of the states to the Confederates, so he allowed bordering states to keep their slaves. Only the slaves in the states that fought against the Union were freed.