I believe the correct answer is: It was a major achievement when it was declared "separate but equal" was unconstitutional.
The outcome of Brown v. Board of Education was a turning point in the history of race relations in the United States. The Supreme Court stripped away constitutional sanctions for segregation by race by declaring that “separate, but equal” was unconstitutional in 1954. The result of Brown v. the Board of Education was a major achievement for Civil Rights Movement.