The Emancipation Proclamation changed the focus of the war.
Up until September 1862, the main focus of the war had been to preserve the Union. With the issuance of the Emancipation Proclamation freedom for slaves now became a legitimate war aim.
It also allowed 'Colored' men to join the US Army.
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Answer:
In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state.