Like in World War I, the state enjoyed a big stimulus to its gunpowder and shipyard industries in World War II. New job opportunities during and after the war in the Wilmington area coaxed African Americans from the southern counties to move to the city. The proportion of blacks constituting the city's population rose from 15% in 1950 to over 50% by 1980. The surge of black migrants to the north sparked white flight in which middle class whites moved from the city to suburban areas, leading to general segregation of Delaware's society. In the 1940s and 1950s, the state attempted to integrate its schools. The University of Delaware admitted its first black student in 1948, and local courts ruled that primary schools had to be integrated. Delaware's integration efforts partially inspired the US Supreme Court's decision in Brown v. Board of Education.