 In "Williams v. Zimmerman", a case appealed to the Maryland Court of Appeals, Marshall in 1937 failed in an effort to desegregate a high school in Baltimore County, which had no public high schools for black teenagers.The legal strategy was successful in the desegration of Baltimore City's Baltimore Polytechnic Institute in 1952.It was not until 1954 that "Brown v. Board of Education" mandated desegregation across the whole of the United States.