After Japan invaded Manchuria in September 1931, the Japanese established the capital of the newly formed puppet state, Manchukuo, in Changchun. The Japanese renamed the city Shinkyō (kanji: 新京, meaning: New Capital), and it is here where the Japanese established the former Emperor Pu-yi as the Emperor of Manchukuo. During the Japanese occupation, the Japanese built much of the infrastructure that still stands today, including the Manchukuo Imperial Palace, the First Clinical Hospital of Jilin University, the Palace of Geology, and several others.