How did the Emancipation Proclamation and the efforts of African American soldiers affect the course of the war?

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The Emancipation Proclamation and the efforts of African American soldiers affected the course of the war in that all slaves would be freed after the war, it increased the North's will to win the war,

Explanation:

it increased the North's will to win the war, and it gave the North a reason to keep fighting and to win the Civil War.

it proved indian land claims were unjustified.