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I recently learned something like this. I may be wrong, but I believe your answer is that the Supreme Court thought it was "unconstitutional"
Answer:
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.