They've really played the long game for their comeback but in more ways than one the ghosts of the confederacy are haunting the US to this day. This is more than LARPing for many of those people.
A coworker once told me that the South was doomed because the North had a larger industrial base. I said that sounded like wisdom in English, but it was a joke in Vietnamese.
The south was doomed because a significant portion of their labor hated them. They also had terrible industrial capacity, no international legitimacy, and no asymmetric advantage.
It's a lot more like when Cambodia invaded Vietnam than when America did.
Not to mentioned the U.S. deployed something like 2.7 million people to Vietnam over the years. ~58,000 U.S. soilders died. Somewhere between 1-3 million people died in the war. Everyone lost that war. With deaths between 95%-98% not being U.S. troops though... It's hard to argue when someone says the U.S. didn't lose. We should have never been there, it was horrible.. but any proud boy I meet in a bar who knows the numbers is going to call that a win... Because they don't care about anything other than how many "bad people" died, and they consider anyone who looks/talks/acts different, bad people.
I believe it was a transitional time for warfare. Muskets weren't much better than earlier technology, their strength was that you didn't need much training at all to use them as opposed to a bow or sword.
In earlier wars, if often came down to whoever broke and fled first, a smaller army fighting for beliefs rather than a Lord could beat a bigger army.
But they undervalued newer technology that could cause havoc by relatively untrained people. It wasn't the same as WW1 where this really showed, but it was definitely on the way.
There's definitely an argument to that logic. 10 bullets in one person may as well be 1. People don't fall down instantly so a volley is likely to do little to a column of troops like Napoleon liked to use.
But I know pretty much nothing about the American civil war, and it sounds like the north was able to produce far more than the south. So probably a bad decision.