Huangpu (黄浦区 Huángpǔ Qū) is an administrative district of Shanghai, the traditional center of the city, with People's Square, the Bund, the East Nanjing Road pedestrian mall and many other attractions.
From around 1000 CE until the 1840s, Shanghai was a prosperous but not remarkably important Chinese town, and a walled city. Then China lost the First Opium War and was forced to open up five treaty ports in which the Western powers who had won the war were granted concessions, areas that they administered and where Chinese law did not apply. Shanghai was one of those, and it grew amazingly fast after that, quickly becoming China's most important commercial center. See Shanghai#History for details.