Not everybody agrees with what you claim, or those numbers.
Roughly 2% of the population, an estimated 620,000 men, lost their lives in the line of duty. Taken as a percentage of today's population, the toll would have risen as high as 6 million souls.
The numbers of Civil War dead were not equaled by the combined toll of other American conflicts until the War in Vietnam. Some believe the number is as high as 850,000. The Civil War Trust does not agree with this claim.
Roughly 2% of the population, an estimated 620,000 men, lost their lives in the line of duty during the Civil War. Taken as a percentage of today's population, the toll would have risen as high as 6 million souls.
www.battlefields.org
A recent paper written by Binghamton University professor Dr. J. David Hacker argues that the true cost of the Civil War is somewhere between 650,000 and 850,000 lives. This is an increase from the traditional figure of 620,000 put forward by Union veterans William F. Fox and Thomas Leonard Livermore in 1889 after an exhaustive study of the army documents and pension records available at the time.
Dr. Hacker used census records from 1850-1880 to construct a pattern of survival rates throughout the troubled decades. His research revealed that the period of 1860-1870 was approximately 750,000 men and women short of the normal survival pattern in the non-war years.
Applying the tools of modern demographic and statistical analysis is immensely valuable to furthering our understanding of the Civil War--we are always striving to add new threads to the tapestry of our shared historical experience. Dr. Hacker provides important insight into the tragic loss of life from 1860-1870. However, his final estimate is very broad, includes civilian casualties, and is not directly linked to the war years of 1861-1865. The Civil War Trust will continue to use Fox's and Livermore's calculation of 620,000 military deaths in the Civil War. We look forward to continued research from Dr. Hacker and others.
civil war, cost of war, scholarship
www.battlefields.org
Hackers' method is flawed, & doesn't distinguish between Confederate deaths vs Union deaths as you allude. Nor does it account for civilian deaths vs military service deaths. Another source says the same:
Although this census-based method does not distinguish between Union and Confederate deaths, Hacker was able to discern patterns for various regions of birth.
The enormous death toll of America’s bloodiest conflict may be even higher than we think, according to one historian’s recent analysis.
www.history.com
I typed in exactly what you suggested, & only got 171,000,000 "results". However, it's worth noting, the sources I quoted, & shared in this post were on the first page.