Answer:
Because of Jim Crow's laws.
Step-by-step explanation:
Jim Crow's laws were maintained in some southern states between 1877 and 1964. These laws were established with the concept of "separate, but equal", which affirmed that it was legal to build schools with racial segregation, but with the same standard of quality. In this case, even if racial segregation became unconstitutional in 1954, states that adopted Jim Crow's laws continued to promote segregation on the grounds that it would not prevent blacks from having quality education, since schools for blacks would have the same level of investment as schools for whites. The problem was that this was not true and schools for blacks were constantly being devalued, which increased the level of racism and prejudice in the place.