At the beginning of World War II, the United States remained neutral until194165438+Pearl Harbor incident on February 7. The next day, the United States declared war on Japan; On the same day, China officially declared war on Japan, when the Sino-Japanese War had been going on for four years. In the next four years, China and the United States carried out a series of cooperation: the two sides reached a loan agreement of US$ 500 million, American general Stilwell became the chief of staff of the China Theater, and China, the United States and Britain held a summit meeting in Cairo to discuss their China strategy. The Cairo Declaration declared that Japan must return its territory.

China played an important role in Roosevelt's conception of the post-war world. His "Four Polices Theory" envisages that the United States, Britain, the Soviet Union and China will maintain peace in a way similar to the World Games. China was placed in the top four, partly out of politeness and partly because the United States needed an Asian supporter. Therefore, the United States supports China to become a permanent member of the United Nations Security Council, regardless of British opposition.

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With the World War II as the boundary, there was always a "third party" in Sino-US relations in the 20th century, with Japan in the first half and the Soviet Union in the second half, forming a "triangular relationship" with China and the United States. After World War I, the United States sacrificed China at the Paris Peace Conference in order to win Japanese participation in the League of Nations. During World War II, China and the United States became allies and defeated Japan together. After the founding of New China, China fell to the Soviet Union and was contained by the United States. Twenty years later, China and the United States formed an alliance to jointly check and balance the Soviet Union. In a sense, the two countries did not enter the real "bilateral relationship" until1990s, and the decade after 20 10 is more likely to be the most important bilateral relationship in the world.

References:

Baidu Encyclopedia-Sino-US Relations