 Complete the following phrase:  Throughout most of this period of time, there were conflicts with the Japanese. The Japanese declared war on Germany early in World War I and had a large contingent in Versailles to participate in treaty negotiations. The resulting Treaty of Versailles in 1919 awarded Germanys holdings in the Pacific, North of the equator, including Shandong, China, to Japan. This led to outrage among the Chinese and to the May Fourth Movement protesting imperialism and instigating violence against westerners. The 1920s was an ongoing period of instability and warlordism. Both Sun Yat-sen and Yuan Shikai died. Chiang Kai-shek consolidated power through the Northern Expedition against warlords in 1926 to 1928, but never really controlled all of China. The Nanking Incident in 1927 again demonstrated Chinese hostility toward imperialist powers. The Chinese Communist Revolution was underway in the late 1920s, and the 