Christianity. It has become very common in all of Africa, including North.
Brown v. Board of Education was a landmark case in which it was finally proven that segregation in institutions of education was highly unconstitutional, so you could say that that is the greatest effect since it made other schools become open for everyone as well.
There’s tons but a few examples would be the us, france, russia, cuba, mexico
I believe the answer is democracy ^^
That is not correct,
I have to add extra words lol