(Tsingtao City Proper), even though they had not had the opportunity to actualize either, respectively. The period in question did not witness much urban progress except for the logical construction of No. 6 Wharf, some Japanese residences, and a small number of roads and streets (Lu 2001, p. 339). Postwar After World War II, the KMT allowed Qingdao to serve as the headquarters of the Western Pacific Fleet of the US Navy in 1945; however, its headquarters were transferred to the Philippines sometime in late 1948. On 2 June 1949, the CPC-led Red Army entered Qingdao and the city and province have been under PRC control since that time. Since the 1984 inauguration of China's open-door policy to foreign trade and investment, Qingdao has rapidly developed into an ultramodern port city. It is now the headquarters of the Chinese navy's northern fleet. An early example of the open-door policy occurred on 5 November 1984, when three United States Naval vessels visited Qingdao. This was the first US port call to China in more than 37 years. , , and and their crews were officially hosted by the Chinese People's Liberation Army Navy (PLAN). Northern Qingdao, particularly Shibei, Licang, and Chengyang districts, are now major manufacturing centers. The city has recently experienced a strong growth period, with a new central business district created to the east of the older business district. Outside of the center of the city, there is a large industrial zone, which includes chemical processing, rubber, and heavy manufacturing, in addition to a growing high-tech area. Numerous local and national service companies, rather than manufacturers, are based in the city's southern district; this, as well as local wind patterns, allows Qingdao to enjoy clean, clear air year-round. Administrative divisions The sub-provincial city of Qingdao has 7 districts () and 3 county-level cities (): Geographically, there are three districts (Shinan, Shibei, Licang) constituting a peninsula on the east coast of the Jiaozhou Bay as the core urban area, one (Chengyang) on the north coast and one (Xihai'an) on the west coast of the Yellow Sea. Defunct - Jiaonan city () - merged into Huangdao District (December 2012) Geography Qingdao is located on the south-facing coast of the Shandong Peninsula (). It borders three prefecture-level cities, namely Yantai to the northeast, Weifang to the west, and Rizhao to the southwest. The city occupies an area totaling , and stretches in