Probably the North's naval blockade of principal southern ports not allowing much needed supplies to get in to hekp conduct the war; and also the cost to a principally agricultural economy of conducting the war itself
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State's rights
Yes.
Wirz - the only Confederate hanged for war-crimes.
The Confederates. Lee and both the Johnstons outclassed Grant and Sherman. But they were badly led by their President, and suffered from the many drawbacks built into the Confederate effort.
Andersonville, Georgia. Its commandant - Wirz - was the only Confederate hanged for war-crimes.