how did the emancipation proclamation change the nature of the war for former slaves and african americans?

Explanation:

On September 22, 1862, he released the preliminary Emancipation Proclamation, which served as a warning to the states in rebellion: if they did not rejoin the Union by January 1, 1863, their slaves would be freed. ... The war was no longer just about preserving the Union— it was also about freeing the slaves.

your answer is c

explanation:

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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