North Carolina had the highest proportion of freedmen before the war, and went farthest at Gettysburg, and at Chickamanga.
considering who was in charge of the state governments when black soldiers would have applied for pensions, I submit it was southern racism post reconstruction that resulted in the wholesale deletion of soldier and substitution of servant for black confederates, and not a Northern conspiracy.
Importantly, they did a poor job of covering up, as they just lined through the word soldier and substituted something else.
The other big giveaway is that a lot of war memorials had very similar names but a simple indicator that one of them was black.