Brown v. Board of Education was a landmark judicial ruling by the Supreme Court that declared that state laws that established separate schools for African-American and white students denied equal educational opportunities.
The ruling was delivered on May 17, 1954, unanimously by the Warren Court; and established that "separate educational facilities are inherently unequal". With this, the Supreme Court reversed the existing precedents from Plessy v. Ferguson of 1896. As a result of this ruling, racial segregation came to be considered as a violation of the Equal Protection Clause of the Fourteenth Amendment to the United States Constitution. This ruling opened the way for racial integration and achieving civil rights for African Americans.
I'm pretty sure the answer is the cabinet. Hope this helps. I'm in the middle of a post test and had this question so I just gave it my best guess by using my notes to help a bit.