After the American Civil War Philadelphia's government was controlled by a corrupt Republican political machine and by the beginning of the 20th Century Philadelphia was described as "corrupt and contented." Various reform efforts slowly changed city government with the most significant in 1950 where a new city charter strengthened the position of mayor and weakened the Philadelphia City Council. At the same time Philadelphia moved its supports from the Republican Party to the Democratic Party which has since created a strong Democratic organization. The city began a population decline in the 1950s as mostly white and middle-class families left for the suburbs. Many of Philadelphia's houses were in poor condition and lacked proper facilities, and gang and mafia warfare plagued the city. Revitalization and gentrification of certain neighborhoods started bringing people back to the city. Promotions and incentives in the 1990s and the early 21st century have improved the city's image and created a condominium boom in Center City and the surrounding areas that has slowed the population decline.