Foreign Policy says:
For years, it has been well-known that Chinese and American military priorities clashed in wartime China. The conflict was crystallized in the confrontation between China's leader Chiang Kai-shek and the American chief of staff sent to China after Pearl Harbor, Gen. Joseph Stilwell, whose brusque manner led to his nickname "Vinegar Joe." Stilwell's diaries showed his contempt for Chiang, whom he nicknamed "the Peanut." Disgusted by the corruption endemic in the wartime capital of Chongqing and the poor state of the Chinese armies, Stilwell launched himself on a collision course with Chiang. Eventually, in 1944, the Chinese leader demanded that Roosevelt recall Stilwell. This moment signaled a fundamental breakdown between the Americans and the Chinese. The view of Chiang as a corrupt and incompetent fool became widespread in a postwar America: Chiang's nickname had become "Cash-my-Check."Yet in recent years, this version of events has been subject to serious historical revisionism in China and the West. There has been a wider recognition that China went to war with Japan in hugely difficult circumstances and with little foreign support. The early 20th century saw a growing confrontation between rising nationalism in China and an ever-more aggressive Japanese imperialism, with the occupation of Manchuria in 1931 the clear signal that Tokyo had aggressive designs on China. On July 7, 1937, fighting broke out between Japanese and Chinese troops at the Marco Polo Bridge near Beijing, and within weeks, China and Japan were locked in full-scale conflict. Over the next eight years, some 14 million Chinese would be killed, some 80 to 100 million would become refugees, and the flawed but real modernization of roads, railways, and industry that had been under way in the 1920s and 1930s would be utterly destroyed.
Read more: http://www.foreignpolicy.com/articles/2013/09/11/bad_manners_us_china_relations_wwii