 Complete the following phrase:  During the Second Sino-Japanese War and World War II, the U.S. provided economic and military assistance to the Chiang Kai-shek government against the Japanese invasion. In particular, the China Hands American diplomats known for their knowledge of China also attempted to establish diplomatic contacts with Mao Zedongs communist regime in their stronghold in Yanan, with a goal of fostering unity between the Nationalists and Communists. However, relations soured after communist victory in the Chinese Civil War and the relocation of the Chiang government to Taiwan, together with the start of the Cold War and rise of McCarthyism in U.S. politics. The newly communist China and the U.S. fought a major undeclared 