If the 1920 decade was not enough drama, stay tuned for the even more dramatic 1930s. The decade tested the new Nationalist government in Nanjing, its leader, Chiang Kai-shek, and China. Internationalism was tossed. Ever so visible with Japan’s aggression toward China. Beginning in 1931 with the Mukden Incident Japan began its campaign to seize complete control of Manchuria. Eventually renaming the region Manchukuo and intending to push farther into China.