When did segregation end for blacks in America?

Answer 1

Executive Order 9981 officially ended segregagtion in the US Military . There were some intergration during the Second World War out of necessity but generally there were segregated units throughout WW2.

or

in 1948

Answer 2

Socially, many parts of America are still segregated, so segregation has not ended. Legal segregation ended gradually. In some states, public schools were never segregated, in others, school desegregation happened in the 19th century, while in others, it took the 1954 Supreme Court decision. Employment and housing discrimination had similar ends, with some states forbidding some forms of discrimination in the 19th century, while others continued to discriminate until the Civil Rights Act of 1964, and even after that until court cases led to meaningful enforcement of that act. Restrictive real-estate covenants that allowed legal racial discrimination in housing remained legal until the Fair Housing Act of 1968.