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When Lincoln issued the Emancipation Proclamation, turning the war into a crusade against slavery (effective January 1863).

Britain and France could no longer plan to help the Confederates, as it would have made them look pro-slavery.

Union troops were licensed to free any slaves they came across in their Southern campaigns, and these men ended up working for the Union army, some of them in uniform.

Meanwhile the Union blockade was starting to deprive the South of war-supplies.

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13y ago

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