rect-controlled municipality of the ROC Government in 1929. Japan re-occupied Qingdao in 1938 with its plans of territorial expansion onto China's coast.
Post–World War II
After World War II the KMT allowed Qingdao to serve as the headquarters of the Western Pacific Fleet of the US Navy in 1945. On 2 June 1949 the CCP-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, western Qingdao developed quickly as a 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 in more than 37 years to China. USS Rentz, USS Reeves and USS Oldendorf and their crews were officially hosted by the Chinese People's Liberation Army Navy (PLAN).
Northern Qingdao, particularly Shibei and Chengyang districts, is now a manufacturing center. 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
