Four Policemen in the context of "Allies of World War II"

The century of humiliation (simplified Chinese: 百年国耻; traditional Chinese: 百年國恥; pinyin: bǎinián guóchǐ) was a period in Chinese history beginning with the First Opium War (1839–1842), and ending in 1945 with China (then the Republic of China) emerging out of the Second World War as one of the Big Four and established as a permanent member of the United Nations Security Council, or alternatively, ending in 1949 with the founding of the People's Republic of China. The century-long period is typified by the decline, defeat and political fragmentation of the Qing dynasty and the subsequent Republic of China, which led to demoralizing foreign intervention, annexation and subjugation of China by Western powers, Russia, and Japan.

The characterization of the period as a "humiliation" arose with an atmosphere of Chinese nationalism following China's defeat in the First Sino-Japanese War of 1894–1895 and the subsequent events including the scramble for concessions in the late 1890s. Since then the idea of national humiliation became a focus of discussions among many Chinese writers and scholars, although they differed somewhat in their understandings of national humiliation; ordinary scholars and constitutionalists also had different understanding of their home country from the anti-Qing revolutionaries in the late Qing period. The idea of national humiliation was also mentioned in late Qing textbooks.

The Dumbarton Oaks Conference, or, more formally, the Washington Conversations on International Peace and Security Organization, was an international conference at which proposals for the establishment of a "general international organization", which was to become the United Nations, were formulated and negotiated. The conference was led by the Four Policemen – the United States, the United Kingdom, the Soviet Union, and China. It was held at the Dumbarton Oaks estate in Washington, D.C., from August 21, 1944, to October 7, 1944.