structural:expansion
The city of Philadelphia was founded and incorporated in 1682 by William Penn in the English Crown Province of Pennsylvania between the Delaware and Schuylkill rivers. Before then, the area was inhabited by the Lenape people. Philadelphia quickly grew into an important colonial city and during the American Revolution was the site of the First and Second Continental Congresses. After the Revolution the city was chosen to be the temporary capital of the United States. At the beginning of the 19th century, the federal and state governments left Philadelphia, but the city remained the cultural and financial center of the country. Philadelphia became one of the first U.S. industrial centers and the city contained a variety of industries, the largest being textiles. After the American Civil War Philadelphia's government was controlled by a 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.