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“the South would have continued to outpace the North, adapt slavery to industrialization, been unconquerable if a later Civil War had broken out”

Sure.

During the war, what was the South’s second largest city?

Any place the Army of the Potomac happened to be on any given day.

[Robert A Cook PE]

Yes, I strongly disagree with that idea that slavery was going to continue to expand, or even be profitable . Machines (coal, steam, then diesel and gss) had it beat everywhere . And it was never profitable outside of large, single crop plantation s.