Attrition.
Grant ended the system of prisoner exchange, knowing that the South, with its much smaller population, would run short of manpower first.
Then he just went on battering away at the Confederate lines till they grew too thin to hold, while Sheridan and Sherman destroyed the rich farmlands that supplied the armies in the field.
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They had more people on there army than the South. Also the slaves were on the North helping defeat the South for their freedom
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The whites did not win the civil war. The reds did. the end
It is possible that at least two inventions not related to way helped the North win the Civil War. The first was the railroad and the other was the McCormick reaper.
In the civil war, the North was called the Union.
to win the civil war