Wang returned to Shanghai in June, 1911, and took another position with the YMCA before being recruited to join the new Republican government in Beijing, then in Sun Yat-sen's opposition government in Canton. He represented the interim Canton government in China's delegation, headed by Lu Zhengxiang, at the Paris Peace Conference, 1919 after World War I. He and Wellington V K Koo, another US-educated lawyer, played prominent roles in presenting the case for returning Shandong to China and in the decision not to sign the Treaty of Versailles because it stipulated the transfer of German rights in Shandong to Japan. Notwithstanding their competitive positions domestically, Wang and Koo joined forces in staunchly promoting the formation of the League of Nations, jointly authoring a pamphlet on the subject. Wang served as foreign minister, minister of finance, minister of justice and acting premier for various short periods of time from 1924–1928, before serving as foreign minister until 1931. He also founded a Shanghai brokerage house; was chairman or board member of mining, cotton milling, and railroad companies; and was Chairman of the Far Eastern Olympics. As foreign minister, Wang negotiated a settlement with Japan over the Jinan Incident of 1928; with Soviet Russia over the Chinese Eastern Railway in Manchuria; treaties restoring Chinese territory in British Weihaiwei and French Tonkin; and tariff autonomy or commercial agreements with more than a dozen countries, including Japan.
Sports
Wang was a keen athlete who fervently believed in sports as a vehicle for national development. He represented China at the Far Eastern Championship Games in 1913 and was later to be the first Chinese member of the International Olympic Committee.
Later life
In spite of his successes in nationalist diplomacy, after the Mukden Incident of 1931 in which Japan seized control of China's Northwest provinces, student protestors targeted Wang for China's ineffective response. Wang was attacked and hospitalized, and withdrew from public office for a time. Wang was Ambassador to the United States from 1936 to 1938. He served in various minor government and party capacities during the war, but in 1949 stayed in Hong Kong rather than go to Taiwan with Chiang Kai-shek's government.
