When did discrimination against blacks and whites end?

Discrimination has been going on for thousands of years, and will probably continue. Some groups become less a target of discrimination in certain time periods, and others become more often targets.

these days in the U. S. of A., Blacks are still victims of discrimination, but less so than 50 or 100 years ago. On the other hand, Arabs (a racial group, often but not always Muslim) and Muslims (a religions group, often but not always Arab) have seen increasing discrimination since a narrow subset of Muslim Arabs attacked on 9/11/2001. But there was also a time when the Irish were victims. There is no way to predict who will be the "bad guys" 50 years in the future.

The best we can do is probably try to get people to be reasonable today and how some of it carries over to tomorrow.