America is the most likely country for this to happen to, due to the unresolved issues surrounding slavery and the abandonment of reconstruction after the civil war. This is compounded when viewed through the USAs founding mythology.
Other countries have done worse, but they haven't done so as hypocritically as the United States.
I don't think an issue that lasted for barely 1/3 of our country's history and hasn't been legal for the entirety of this century, last century, or much of the century before that is the problem. I think people's addiction to being full-time victims is the issue, because if you're always a victim, you never have to be responsbile for anything in your life, you can always blame your imagined "oppressor". People do this, teach their children that they are also victims regardless of their actions, and maintain a long line of familial victimhood. DEI is a direct symptom of that.
Other countries have done worse, but they haven't done so as hypocritically as the United States.