That's true. It's hard to say. I do know that it was thought that forcing schools to not be segregated would cause the contact hypothesis to come into play and

That's true. It's hard to say. I do know that it was thought that forcing schools to not be segregated would cause the contact hypothesis to come into play and reduce prejudice in children. It was a part of Brown vs. Board of Education. That seems to have worked too, but that was for children. They may not have had much prejudice to begin with.