Since this was a total war fought only on American soil, I also count the civilians, mostly in the South, who died of starvation, exposure, and epidemics during and immediately following the war.
But you’re right. 700,000 battlefield casualties is not millions.
These mostly Southern civilians died because of the actions of an army flying which flag?
The army flying either that hated, traitorous Stars & Bars or the Confederate Battle Flag was responsible for how many Northern civilian battle casualties or subsequent deaths due to their scorched earth policies?
Someone did that accounting, and came up with just under a million dead as the "price" of the war.
The fact suggests many questions. Its consequences are demonstrable, and pleasing only to Unionists, millionaires, Marxists, and Yankee triumphalists.