Why in the world would want to debate this subject?
Just look at the enormous wealth the North possessed versus the South's resources.
What I look at is, the number of regiments the North was able to assemble. Good lord, look at New York, 188 Regiments; Ohio, 175 Regiments, etc.
The South had no way of competing with these numbers not-withstanding the brilliance of her commanders.
This, not withstanding the blockade of her coasts.