quality:corruption
Japan

In parallel with 20th-century German militarism, Japanese militarism began with a series of events by which the military gained prominence in dictating Japan's affairs. This was evident in 15th-century Japan's Sengoku period or Age of Warring States, where powerful samurai warlords (daimyōs) played a significant role in Japanese politics. Japan's militarism is deeply rooted in the ancient samurai tradition, centuries before Japan's modernization. Even though a militarist philosophy was intrinsic to the shogunates, a nationalist style of militarism developed after the Meiji Restoration, which restored the Emperor to power and began the Empire of Japan. It is exemplified by the 1882 Imperial Rescript to Soldiers and Sailors, which called for all members of the armed forces to have an absolute personal loyalty to the Emperor.

In the 20th century (approximately in the 1920s), two factors contributed both to the power of the military and chaos within its ranks. One was the "Military Ministers to be Active-Duty Officers Law", which required the Imperial Japanese Army (IJA) and Imperial Japanese Navy (IJN) to agree to the Ministry of Army position in the Cabinet. This essentially gave the military veto power over the formation of any Cabinet in the ostensibly parliamentary country. Another factor was gekokujō, or institutionalized disobedience by junior officers. It was not uncommon for radical junior officers to press their goals, to the extent of assassinating their seniors. In 1936, this phenomenon resulted in the February 26 Incident, in which junior officers attempted a coup d'état and killed leading members of the Japanese government. The rebellion enraged Emperor Hirohito and he ordered its suppression, which was successfully carried out by loyal members of the military.

In the 1930s, the Great Depression damaged Japan's economy and gave radical elements within the Japanese military the chance to realize their ambitions of conquering all of Asia. In 1931, the Kwantung Army (a Japanese military force stationed in Manchuria) staged the Mukden Incident, which sparked the Invasion of Manchuria and its transformation into the Japanese puppet state of Manchukuo. Six years later, the Marco Polo Bridge Incident outside Peking sparked the Second Sino-Japanese War (1937–1945). Japanese troops streamed into China, conquering Peking, Shanghai, and the national capital of Nanking; the last conquest was followed by the Nanking Massacre. In 1940, Japan entered into an alliance with Nazi Germany and Fascist Italy, two similarly militaristic states in Europe, and advanced out of China and into Southeast Asia. The following year, Japan attacked Pearl Harbor to prevent the intervention of the United States, which had banned oil sales to Japan in response to the Second Sino-Japanese War and the ensuing invasion of Indochina.

In 1945, Japan surrendered to the United States, beginning the Occupation of Japan and the purging of all militarist influences from Japanese society and politics. In 1947, the new Constitution of Japan supplanted the Meiji Constitution as the fundamental law of the country, replacing the rule of the Emperor with parliamentary government. With this event, the Empire of Japan officially came to an end and the modern State of Japan was founded.