Answer:
After the Emancipation Proclamation was issued thousands of slaves were freed from ten Confederate states that were in rebellion. The Proclamation also allowed African Americans to join the Union army and help fight the Confederates which increased the Union's numbers by about 200,000.
In other words,
Thousands of slaves joined the Union armies
Explanation:
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~DuffyDuck~
Answer: Causes: Lincoln understood that slavery was important to the South's success in the war; abolitionists were calling for emancipation. Effects: It changed the war into a war for freedom, kept Britain from supporting the South's independence, united African Americans in support of the war.
Explanation: hope this helps