Mostly because they needed more manpower to turn the tide of the war. This includes the U.S, Germany, France, etc.
create a heroic out look on the war, and encurage more men to fight in the war.
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Answer: Slavery was a point of contention in the United States since the country's founding. The disagreement intensified as the 1800s began. In 1820, the Missouri Compromise established a boundary that wouldn't allow new slave states above this line. Dred Scott had been taken by his owner to an area in which slavery had been made illegal because of the Missouri Compromise.
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