Japan participated in World War II from 1939 to 1945 as a member of the Axis. World War II and the Second Sino-Japanese War encapsulated a significant period in the history of the Empire of Japan, marked by significant military campaigns and geopolitical maneuvers across the Asia-Pacific region. Spanning from the early 1930s to 1945, Japan employed imperialist policies and aggressive military actions, including the invasion of the Republic of China, and the Military Occupation of French Indochina.
In 1941, Japan attempted to improve relations with the United States in order to reopen trade, especially for oil, but was rebuffed. On 7 December 1941, Japan attacked multiple American and British positions in the Pacific. The Pacific War, a major theater of World War II, further intensified Japan's engagements, leading to significant confrontations with Allied forces in the Pacific Ocean and Southeast Asia. Although initially successful, Japan took significant losses at the Battle of Midway. In addition, Japan met significant setbacks in China. On 6 and 9 August 1945, Japan was hit by two atomic bombs, while the Soviet Union declared war and invaded Manchuria on 8 August. These events led to the surrender of Japan on 15 August.
During the war, the Japanese committed war crimes, including attacking neutral countries without a prior declaration of war, massacres and rapes of civilians, especially in the Rape of Nanking, the use of comfort women, and biological and chemical warfare and experimentation. In addition, prisoners of war were mistreated, executed, and experimented on. Modern day Japan continues to deny these atrocities.
Prelude The Empire of Japan had been expanding its territory since the First Sino-Japanese and Russo-Japanese Wars, before World War I through the colonisation of Taiwan and Korea. In 1931, Japan invaded and conquered Manchuria in northeast China. The bordering Chinese territory of Jehol was also taken in 1933, and in 1936, Japan created a similar puppet state in Inner Mongolia.
Japanese invasion of China
The Second Sino-Japanese War (1937–1945) was a military conflict that was primarily waged between the Republic of China and the Empire of Japan. The war made up the Chinese theater of the wider Pacific Theater of the Second World War. The beginning of the war is conventionally dated to the Marco Polo Bridge Incident on 7 July 1937, when a dispute between Japanese and Chinese troops in Beijing escalated into a full-scale invasion. This full-scale war between the Chinese and the Empire of Japan is often regarded as the beginning of World War II in Asia. (However, according to the Chinese Ministry of Education, it marked only a phase in a 14-year war that began with the 1931 invasion of Manchuria.In 2017 the Ministry of Education in the People's Republic of China decreed that the term "eight-year war" in all textbooks should be replaced by "fourteen-year war", with a revised starting date of 18 September 1931, the start of the Japanese invasion of Manchuria; () According to historian Rana Mitter, historians in China are unhappy with the blanket revision, and despite sustained tensions, the Republic of China did not consider itself to be continuously at war with Japan over these six years; see The Tanggu Truce of 1933 officially ended the earlier hostilities in Manchuria while the He-Umezu Agreement of 1935 acknowledged the Japanese demands to put an end to all anti-Japanese organizations in China.)
As part of its operations against China, on 22 September 1940 Japan invaded French Indochina. On 27 September it signed the Tripartite Pact with Germany and Italy. War with the U.S. and other Western allies of World War II began with the attack on Pearl Harbor on 7 December 1941. Over the course of seven hours there were coordinated Japanese attacks on the U.S.-held Philippines, Guam and Wake Island, the Dutch Empire in the Dutch East Indies, Thailand and on the British Empire in Borneo, Malaya and Hong Kong. The strategic goals of the offensive were to destroy the U.S. Pacific fleet, capture oil fields in the Dutch East Indies, and maintain their sphere of influence in East Asia. It was also to expand the outer reaches of the Japanese Empire to create a formidable defensive perimeter around newly acquired territory.
China fought Japan with aid from the Soviet Union and the United States. After the Japanese attacks on Malaya and Pearl Harbor in 1941, the war merged with other conflicts which are generally categorized under those conflicts of World War II as a major sector known as the China Burma India Theater. Some scholars consider the European War and the Pacific War to be entirely separate, albeit concurrent wars. Other scholars consider the start of the full-scale Second Sino-Japanese War in 1937 to have been the beginning of World War II. The Second Sino-Japanese War was the largest Asian war in the 20th century. It accounted for the majority of civilian and military casualties in the Pacific War, with between 10 and 25 million Chinese civilians and over 4 million Chinese and Japanese military personnel missing or dying from war-related violence, famine, and other causes. The war has been called "the Asian holocaust".
Decision process by Japanese leaders
The decision by Japan to attack the United States remains controversial. Study groups in Japan had predicted ultimate disaster in a war between Japan and the U.S., and the Japanese economy was already straining to keep up with the demands of the War with China. However, the U.S. had placed an oil embargo on Japan and Japan felt that the United States' demands of unconditional withdrawal from China and non-aggression pacts with other Pacific powers were unacceptable. Facing an oil embargo by the United States as well as dwindling domestic reserves, the Japanese government decided to execute a plan developed by the military branch largely led by Osami Nagano and Isoroku Yamamoto to bomb the United States naval base in Hawaii, thereby bringing the United States to World War II on the side of the Allies. On 4 September 1941, the Japanese Third Konoe Cabinet (Prime Minister Fumimaro Konoe) met to consider the war plans prepared by Imperial General Headquarters, and decided:
Our Empire, for the purpose of self-defense and self-preservation, will complete preparations for war ... [and is] ... resolved to go to war with the United States, Great Britain, and the Netherlands if necessary. Our Empire will concurrently take all possible diplomatic measures vis-a-vis the United States and Great Britain, and thereby endeavor to obtain our objectives ... In the event that there is no prospect of our demands being met by the first ten days of October through the diplomatic negotiations mentioned above, we will immediately decide to commence hostilities against the United States, Britain and the Netherlands.
Vice Admiral Isoroku Yamamoto, the chief architect of the attack on Pearl Harbor, had strong misgivings about war with the United States. Yamamoto had spent time in the United States during his youth when he studied as a language student at Harvard University (1919–1921) and later served as assistant naval attaché in Washington, D.C. Understanding the inherent dangers of war with the United States, Yamamoto warned his fellow countrymen: "We can run wild for six months or maybe a year, but after that, I have utterly no confidence".
Origin of conflict
Since early 1941 the United States and Japan had been engaged in negotiations in an attempt to improve their strained relations and end the war in China. During these negotiations, Japan advanced a number of proposals which were dismissed by the Americans as inadequate. At the same time the United States, the United Kingdom, and the Netherlands engaged in secret discussions for the joint defense of their territories, in the event of a Japanese attack against any of them. Roosevelt reinforced the Philippines (an American protectorate scheduled for independence in 1946) and warned Japan that the United States would react to Japanese attacks against any "neighboring countries".
Frustrated at the lack of progress and feeling the pinch of the American–British–Dutch sanctions, Japan prepared for war. On 20 November, a new government under Prime Minister Hideki Tojo presented an interim proposal as its final offer. It called for the end of American aid to China and for lifting the embargo on the supply of oil and other resources to Japan. In exchange, Japan promised not to launch any attacks in Southeast Asia and to withdraw its forces from southern Indochina. The American counter-proposal of 26 November required that Japan evacuate all of China without conditions and conclude non-aggression pacts with all Pacific powers.The United States Replies . Investigation of the Pearl Harbor attack. That meant Japan was essentially forced to choose between abandoning its ambitions in China, or seizing the natural resources it needed in the Dutch East Indies by force;: "The United States cut off oil exports to Japan in the summer of 1941, forcing Japanese leaders to choose between going to war to seize the oil fields of the Netherlands East Indies or giving in to U.S. pressure.", listing various military and diplomatic developments, observes that "the threat to Japan was not purely economic." the Japanese military did not consider the former an option, and many officers considered the oil embargo an unspoken declaration of war.
Japan planned to rapidly seize European colonies in Asia to create a large defensive perimeter stretching into the Central Pacific. The Japanese would then be free to exploit the resources of Southeast Asia while exhausting the over-stretched Allies by fighting a defensive war., calls attention to the fact that "the Allied struggle against Japan exposed the racist underpinnings of the European and American colonial structure. Japan did not invade independent countries in southern Asia. It invaded colonial outposts which the Westerners had dominated for generations, taking absolutely for granted their racial and cultural superiority over their Asian subjects." Dower goes on to note that, before the horrors of Japanese occupation made themselves felt, many Asians responded favourably to the victories of the Imperial Japanese forces.The phrase "by fighting a defensive war" is unclear whether the Allies or Japan are fighting the defensive war. Use a comma-separated relative clause. To prevent American intervention while securing the perimeter, it was further planned to neutralize the United States Pacific Fleet and the American military presence in the Philippines from the outset.
Japanese offensives (1941–1942)
On 7 December 1941 (8 December in Asian time zones), Japan attacked British and American holdings with near-simultaneous offensives against Southeast Asia and the Central Pacific. These included an attack on the American fleets at Pearl Harbor and the Philippines, Guam, Wake Island, landings in Malaya, Thailand, the Shanghai International Settlement and the Battle of Hong Kong.Keegan, John (1989) The Second World War. New York: Viking. pp. 256-57.