Please explain.
It is my understanding that the USA was founded on a more decidedly Christian (namely Protestant, especially at the time) social and spiritual foundation. With the slavery then racism questions being inherent thorns that required Christian-motivated abolition and activism.
But the French Revolution was fundamentally an atheistic enterprise, not just anti-Church, but anti-GOD Himself - and that the spirits at work laid the groundwork for unleashing the Marxism and Nazism of the 20th Century.
https://unherd.com/2020/09/how-the-french-revolution-caused-nazism/