Historically speaking, how much better off would America have been if this shithole was exterminated or otherwise depopulated after the Civil War and replaced with Northern white Anglo and Germanic stock? You know, like literally any other fucking non cucked country would have done?

Considering that most things wrong with America(and subsequently, the world) today came from the South and the consequences of sparing it, would it have been able to prevent the shitty modern world we live in today?