Well maybe if you studied up on it a little bit.
Your claim contradicts some real experts on Lincolns war.
Like who?
For example, in this thread, it was said: When you pro-Confederates pretend the Civil War was not about slavery, by that you mean neither side fought to defend or defeat slavery, right? This song puts the lie to your claims.
So one song defines the Union war effort?
“Like who?”
I’m not one to name names, but if you happen by post 17 on this thread you’ll see what I mean.
Are you going to tell me this person is not a real expert?
The writer of the song intended it to be archetypal. The northern people accepted it as archetypal and adopted it as their de facto war anthem.
You could cut the ground out from under this argument by calling the song mythology. I would have to concede your point.