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In 1940, non-Hispanic whites constituted 86.8% of the city's population. The population peaked at more than two million residents in 1950, then began to decline with the restructuring of industry, which led to the loss of many middle-class union jobs. In addition, suburbanization had been drawing off many of the wealthier residents to outlying railroad commuting towns and newer housing. Revitalization and gentrification of neighborhoods began in the late 1970s and continues into the 21st century, with much of the development in the Center City and University City areas of the city. After many of the old manufacturers and businesses left Philadelphia or shut down, the city started attracting service businesses and began to more aggressively market itself as a tourist destination. Glass-and-granite skyscrapers were built in Center City. Historic areas such as Independence National Historical Park located in Old City and Society Hill were renovated during the reformist mayoral era of the 1950s through the 1980s. They are now among the most desirable living areas of Center City. This has slowed the city's 40-year population decline after it lost nearly one-quarter of its population.

Why did the population decline after this time?
Answer: the loss of many middle-class union jobs
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Jidaigeki (literally historical drama) has always been a staple program on Japanese movies and television. The programs typically feature a samurai. Samurai films and westerns share a number of similarities and the two have influenced each other over the years. One of Japan’s most renowned directors, Akira Kurosawa, greatly influenced the samurai aspect in western film-making.[citation needed] George Lucas’ Star Wars series incorporated many aspects from the Seven Samurai film. One example is that in the Japanese film, seven samurai warriors are hired by local farmers to protect their land from being overrun by bandits; In George Lucas’ Star Wars: A New Hope, a similar situation arises. Kurosawa was inspired by the works of director John Ford and in turn Kurosawa's works have been remade into westerns such as The Seven Samurai into The Magnificent Seven and Yojimbo into A Fistful of Dollars. There is also a 26 episode anime adaptation (Samurai 7) of The Seven Samurai. Along with film, literature containing samurai influences are seen as well.

What western was inspired by 'Seven Samurai'?
Answer: The Magnificent Seven
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In December 2011, Xinhua stated that "[t]he basic structure of the Beidou system has now been established, and engineers are now conducting comprehensive system test and evaluation. The system will provide test-run services of positioning, navigation and time for China and the neighboring areas before the end of this year, according to the authorities." The system became operational in the China region that same month. The global navigation system should be finished by 2020. As of December 2012, 16 satellites for BeiDou-2 have been launched, 14 of them are in service.

When is it projected that the global navigation system will be finished?
Answer:
by 2020