From 1945 to 1980 inequality was the lowest in the USA. From 1980 onward economic inequality exploded. I understand that you cannot follow my point without this important piece of information.
So you're talking strictly about economic inequality. Because in 1953 we were still 10 years away from the end of legal segregation.
By the eay things are going, we may be 10 or less years away from legal resegration. The administration is actively working on that.