During Beiyang government: stepping up the fight for China with Japan. It has successively fostered Li, Yuan Shikai, clique, Yunnan and Guangxi warlords.

During China's ten-year Anti-Japanese War; Actively support Chiang Kai-shek.

War of Resistance against Japanese Aggression period: China and the United States established cooperative relations and both became members of the world anti-fascist alliance.

During the War of Liberation; The United States pursues the policy of "supporting Chiang Kai-shek against * * *"

After the founding of New China, the western world, led by the United States, adopted a policy of political non-recognition, economic blockade and embargo, military siege and diplomatic isolation against China in an attempt to stifle the new China. 1950, the United States launched a war of aggression against the DPRK, and China launched a war to resist US aggression and aid Korea.

1972 February, US President Nixon visited China. On the 28th, China and the United States signed the Sino-US Joint Communiqué 1978 16 in Shanghai, and the Sino-US Joint Communiqué on the Establishment of Diplomatic Relations was published, formally establishing diplomatic relations.