618,222, the next landmark number for the US.

[Gawdzilla Sama]

618,222, but not for the reason you think.

For 110 years, the numbers stood as gospel: 618,222 men died in the Civil War, 360,222 from the North and 258,000 from the South — by far the greatest toll of any war in American history. But new research shows that the numbers were far too low.

Apr 3, 2012

https://www.nytimes.com/2012/04/03/scien...0too%20low.

[BrianSoddingBoru4]

This seems one of the crucial bits:

Pretty simple — but, Dr. Hacker soon realized, too simple for counting Civil War dead. Published census data from the era did not differentiate between native-born Americans and immigrants; about 500,000 foreign-born soldiers served in the Union Army alone.

There's even songs about it.

Boru

[Gawdzilla Sama]

Whatever the exact number we've always used the ACW as our benchmark for deaths.