Why is this decision historically important? Segregation, “separate but equal”, is illegal.

:))

Segregation is still sperating races and though it claims to be "equal" it will cause division and further racism.

Explanation:

"Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine. The case stemmed from an 1892 incident in which African American train 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."

the third answer

explanation:

because