This question could be answered in a few ways, but in my opinion the confederates of the south should have won the civil war. They outkilled the union by over 100,000 men but were outnumbered by nearly 120,000 men after Gettysburg so were forced to make an unwilling retreat.Also,when the confederates attacked Washington DC they could have taken over the capitol,but graciously didn't because after that tragic lose for the north they thought the north would leave them alone. It was that mistake that lot them the war.
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The South believed it was stronger because it had cotton (chief export of the USA) and a more soldierlike people to recruit from, as well as the inspiring mission of repelling invaders.
The North believed (correctly) that it was stronger because it had a bigger population, an advanced manufacturing industry and the naval power to blockade Southern ports.
So each side thought it was stronger, and also refused to believe that the other side was serious in its threats.
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.
The easiest anwser is that the North had technology, shear number of troops, and industry on their side. The South had much better generals, a more willingness to fight, and that the war was fought in their back yard
Native Americans fought on both sides in the US civil war. In some cases, tribes split over which side to support, best known of which was the Cherokee. ´Indians´ is misleading. It creates an idea that they were a single unified group.
The north side
The left side