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One fifth of the population of Georgia did not die just to preserve slavery.

That figure seems way too high.

Do you have documentation?

[Archie Bunker on steroids]

That was the number used in Ken Burns Civil War 1989 documentary that I watched about two months ago....do not see anything on line to support this number. Georgia was absolutely devastated during the war....Sherman leveled the state from the Tennessee border to Savanna and it took Georgia decades to recover. Older in law family members tell passed down stories of entire devastation.
Military combat death estimates range from 10% to 20% of those served....cannot find civilian death percentages.