I believe this is true.
Lincoln’s war hurt everyone, then and now.
Something I have come to realize. It's still hurting the USA. Our leviathan Federal government is a consequence of that war. So is "gay marriage", "abortion", banning prayer in schools, and a whole host of other troubles.
Ironically, two Ivy League schools, Brown and Yale, are named after their first major benefactors, who both obtained their massive fortunes in the slave trade. And, at northern points of entry.
Slavery thrived in the North, until it was no longer necessary.
Then, it suddenly became the South’s great sin, according to the northern virtue-signalers.