Manchukuo, officially the State of Manchuria prior to 1934 and the Empire of Manchuria after 1934, was a puppet state of the Empire of Japan in North-east China and Inner Mongolia from 1932 until 1945. It was founded in 1932 after the Japanese invasion of Manchuria, and in 1934 it became a constitutional monarchy. Under the de facto control of Japan, it had limited international recognition.
The area was the homeland of the Manchus, including the emperors of the Qing dynasty. In 1931, the region was seized by Japan following the Mukden Incident. A pro-Japanese government was installed one year later with Puyi, the last Qing emperor, as the nominal regent and later emperor. Manchukuo's government was dissolved in 1945 after the surrender of Imperial Japan at the end of World War II. The territories claimed by Manchukuo were first seized in the Soviet invasion of Manchuria in August 1945, and then formally transferred to Chinese administration in the following year.
Manchus formed a minority in Manchukuo, whose largest ethnic group was Han Chinese. The population of Koreans increased during the Manchukuo period, and there were also Japanese, Mongols, White Russians and other minorities. The Mongol regions of western Manchukuo were ruled under a slightly different system in acknowledgement of the Mongolian traditions there. The southern tip of the Liaodong Peninsula (present-day Dalian) continued to be directly ruled by Japan as the Kwantung Leased Territory.