In the 1990s, New York City began closing the large, public high schools in the Bronx and replacing them with small high schools. Among the reasons cited for the changes were poor graduation rates and concerns about safety. Schools that have been closed or reduced in size include John F. Kennedy, James Monroe, Taft, Theodore Roosevelt, Adlai Stevenson, Evander Childs, Christopher Columbus, Morris, Walton, and South Bronx High Schools. More recently the City has started phasing out large middle schools, also replacing them with smaller schools.