Question

What are two important long-term strategies developed by the North to win the Civil War?

Answer 1

I know one strategy was the art of the "general"
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Answer 2

#1. Blockading the Southern ports, to starve the South of war supplies from abroad.
#2. Liberating the Mississippi, to divide the Confederacy into two, isolating all armies to the West of the river. 
Hope this helps u out ^-^