1.What was the basis of the decision in the Brown V.Board of Education?

[Elizabeth B]

What did the case do for African Americans?
What case did this one make no longer void?

[Frank Drebin]

The basis was the question if the 14th Amendment prohibited racial discrimination in the public schools. It voided the previous court ruling that segregation was permissible if there were equal facilities for both: Plessy v. Ferguson. It generally influenced the civil rights movement.

[mumba]

With Brown v. Board, Cheif Justice Earl Warren made segregation illegal. The Court unanimously found that Plessy v. Fuerguson ("separate but equal" legally established segregation), was void because separate but equal is "inherently unequal." Unfortunately they requested that this new law be implemented with "all deliberate speed," and this took many generations (they should've set a time like within 3-4 months or something). There was a southern resistence with the resurgence of the KKK, but the Civil Rights Movement was on the right track.
By the way, Thurgood Marshall (later the first black man on the Supreme Court) represented the NAACP in this case.

[jay23boy]

It claimed "separate but equal" is unjust and allowed African Americans to go to same public places as whites. And the case that was no longer void was Plessy vs Ferguson