7. What was the underlining theme of Plessy v. Ferguson?

racial segregation under the "separate but equal" doctrine.

Explanation:

passenger Homer Plessy refused to sit in a car for blacks. Rejecting Plessy's argument that his constitutional rights were violated, the Supreme Court ruled that a law that "implies merely a legal distinction" between whites and blacks was not unconstitutional. As a result, restrictive Jim Crow legislation and separate public accommodations based on race became commonplace.