“In 1860 Southerners already had everything 1776 Founders went to war to win . . .”
The 13 Free and Independent states that defended themselves against King George, and the 13 free and independent states (say 11) that defended themselves against Lincoln - all of them had slaves. Is that your point?
THE big difference was that there were two competing superpowers in the 1770s. There were not in the 1860s.
No, my point is our Founders went to war in 1776 to make possible their 1787 Constitution.
In 1860 Confederates declared secession from that Constitution and in 1861 war against it.
That's what makes any comparisons of Founders to Confederates totally bogus.