Before he could issue the emancipation proclamation, president lincoln waited for a) the selection of a confederate president. b) the results of a national vote on slavery. c) a successful confederate military action. d) a successful union military action.

D. A successful Union military action.

On July 22, 1862 President Lincoln informed his cabinet that  he would issue a proclamation in order to free the slaves but also said  that  in order to make the announcement he will wait until the Union Army has achieved a substantial military victory.

D

Explanation:

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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