Essentially yes. The commonly accepted range for total combined deaths alone in the Civil War is about 625k-675k. In WW1 the US had about 100k dead, WW2 was about 400k, Vietnam was 60k, and Korea was 55k.

The scale of death in the Civil War is really something the country has never even come close to again. About 2% of the population was killed compared to .3% in WW2.