brought by a massive influx of federal workers to the capital, led to extensive development of the region and the linking of the area encompassed by the Anacostia Historic District with other parts of Southeast D.C. Only 16 percent of the homes in Southeast Washington below Pennsylvania Avenue SE were built prior to 1940, but 38 percent were built after 1950. Suburbanization dramatically changed the area in the 1960s and 1970s. The Anacostia neighborhood, which had been 82.4 percent white in 1950, was only 67.7 percent white in 1960 and 86 percent black by 1970. The influx of large numbers of low-income African Americans, coupled with the economic dislocations caused by the 1968 Martin Luther King, Jr. assassination riots, led many businesses to leave the Anacostia business district. During the crack epidemic in Washington in the 1980s, the Anacostia neighborhood became synonymous with crime and violence, and had one of the highest crime rates in the District of Columbia (albeit not in all crimes)—leading to further deterioration in the condition of the buildings in the area. Recent actions regarding the district The southern part of the Washington Metro's Green Line was originally designed to pass over the 11th Street Bridges to the intersection of Good Hope Road SE and Martin Luther King, Jr. Avenue SE. The site of the Anacostia Station at this intersection led to concerns that the Metro station would destroy the character of historic Anacostia, and after pressure from the federal government Metro moved the site of the station to Howard Road SE. The Anacostia Historic District was added to the National Register of Historic Places in 1978. After the 1990 census required the District government to redistrict the borders of its electoral districts (wards), a proposal was made to split the Anacostia Historic District between Ward 7 and Ward 8. This proposal was defeated. Efforts have been made to improve the physical and economic conditions in the Historic District. The area's designation as a historic district has been used to prevent the McDonald's corporation from moving into the area, the relocation of a homeless shelter to the area, and the construction of moderate-income rowhouses. In 1992, the city began replacing concrete sidewalks in the Anacostia Historic District with red brick to restore the sidewalks to their original condition. In 2002, the city adopted the Historic Housing Tax Credit Act of 2002, which allowed homeowners in the