What could have been done to end racial discrimination against nonwhites in the united states at the turn of the century?

Well, to start, the Supreme Court could have ruled differently in Plessy v. Ferguson.

In Plessy, the Supreme Court condoned the practice of "separate but equal" making it permissible for the white south (and north) to create discriminatory practices.

entering that problem on the tube you may come up with an answer

the answer is prolly b