Please, let's not let political correctness stand in the way of telling unvarnished truth.
Also, proportionately, more freed-blacks served and died in that cause than Northern whites.
Indeed, the percentages of freed-blacks who served & died was roughly the same as Southern Democrat whites.
Good point, and we should remember, black soldiers weren’t allowed to serve until the second half of 1862, and it started slowly. By the end of the conflict, 179,000 were in the Union army, many if not most never serving in combat, but performing essential duties that previously had been solely filled by white soldiers; after the war a number of black veterans (and eventually, some new enlistments) were assigned to western forts with a number of those winding up in cavalry units.
A freakish handful of black soldiers served (or well after the war, purported to have served) for some of the CSA states’ forces.
It was their cause, I would expect them to put personal effort into it. And not all Southerners agreed with slavery, me being one. But it is the politicians who rule the roost until the day citizens get fed up and act like employers instead of slaves themselves!