The Union was more industrialized, and had a larger number of troops
The Confederacy was making a defence on home ground, and had experienced military officers.
A fun fact is that before the war happened General Robert E. Lee was actually asked to be a Officer for the Union but when his home state resided from the union he decided to become and officer for the Confederacy. The reason behind his decision is because he didn't want to be fighting against his home state.
Hope this helped
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