Shanghai is one of the most populous and developed cities in the People's Republic of China. It is located on the estuary of the Yangtze River. North of city, the river pours into the East China Sea. Owing to its advantageous geographic location, Shanghai has become a prosperous busy port.
Shanghai dates back to the Neolithic Period. This area was marshland until the Song Dynasty (AD 960-1126), when Mongols and other northern nomad invaders officially established the town. The increasing trade turned Shanghai into a prosperous place. By 1291, it became a county capital. After that the economy saw even greater development, especially in cotton and textile industries.
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