How did president lincoln's emancipation proclamation affect the institution of slavery?

a.
it freed all slaves within the united states' borders.

b.
it freed only the slaves in the border states.

c.
it freed all slaves north of the mason-dixon line.

d.
it freed only the slaves in confederate territory.

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D. It free only the slaves in Confederate territory

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D. It freed only the slaves in Confederate territory.

Explanation:

I took a test and it had this question and I got it right.

b]to spread the message of black power