Not to be an asshole or anything because it really doesn't matter. But your source is for shit. Probably a kid in a basement.
But again, those numbers are just crazy. I could site a dozen sources but don't have time. here's one for you.
"The men of the Buffalo Soldiers were the only African Americans that fought during the war. Up to 5,000 "Black men" enlisted in volunteer regiments in the Spanish–American War.[15] Several African-American regiments of United States Volunteers were formed and nicknamed "Immune Regiments", but none of these volunteer regiments served overseas in that war.[16]"
https://en.wikipedia.org/wiki/Buffalo_Soldier
Your source for the Buffalo soldiers is getting his facts screwed up. We are talking Buffalo soldiers. Not the total number of Blacks that fought in the Civil war.
By the end of the Civil War, roughly 179,000 black men (10% of the Union Army) served as soldiers in the U.S. Army and another 19,000 served in the Navy. Nearly 40,000 black soldiers died over the course of the war—30,000 of infection or disease.
yeah, You are right that link is probably shit when it comes to exact historical numbers.
My point remains though... that EVERYONES ancestors (Indians, Blacks, whites, Asians etc) have been involved in or done some terrible things throughout history or been on the receiving end of it at some point. Manipulative Politicians & people will try use history to gain power or resources from others through guilt or turn groups on others through festering resentment, blame, entitlement...but in reality you are I or anyone else, cannot be held responsible or made to feel accountable somehow for other peoples behaviour or failures, or even the bad things your leaders or politicians have done or will do. That's on them.
These are things you and I had or have no control over...
UNLESS of coarse you actually KNOW they are corrupt to the core....and you vote and elevate this kind of person into power anyway...**cough *Hillary **cough** Clinton