World War II, or the Second World War,[1] (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including all of the great powers,[2] organized into two opposing military alliances: the Allies and the Axis. The war involved the mobilization of over 100 million military personnel, making it the most widespread war in history. In a state of "total war", the major participants placed their complete economic, industrial, and scientific capabilities at the service of the war effort, erasing the distinction between civilian and military resources. Over 70 million people, the majority of them civilians, were killed, making it the deadliest conflict in human history.[3]
The starting date of the war is generally held to be September 1939 with the German invasion of Poland and subsequent declarations of war on Germany by the United Kingdom, France and the British Dominions.[4][5] However, as a result of other events, many belligerents entered the war before or after this date, during a period which spanned from 1937 to 1941. Amongst these main events are the Marco Polo Bridge Incident, the start of Operation Barbarossa and the attack on Pearl Harbor and British and Dutch colonies in South East Asia.
The Soviet Union and the United States emerged from the war as the world's leading superpowers. This set the stage for the Cold War, which lasted for the next 45 years. The United Nations was formed in the hope of preventing another such conflict. The self determination spawned by the war accelerated decolonisation movements in Asia and Africa, while Western Europe itself began moving toward integration.
The Nazis were responsible for the killing of approximately six million Jews (overwhelmingly Ashkenazi) as well as two million ethnic Poles and four million others who were deemed "unworthy of life" (including the disabled and mentally ill, Soviet POWs, homosexuals, Freemasons, Jehovah's Witnesses, and the Roma) as part of a program of deliberate extermination planned and executed by the Nazi Germany. About 12 million, most of whom were Eastern Europeans, were employed in the German war economy as forced labor in Germany during World War II.[204]
In addition to the Nazi concentration camps, the Soviet Gulag, or labor camps, led to the death of citizens of occupied countries such as Poland, Lithuania, Latvia, and Estonia, as well as German prisoners of war (POW) and even Soviet citizens themselves who had been or were thought to be supporters of the Nazis.[205] Sixty percent of Soviet POWs died during the war.[206] Richard Overy gives the number of 5.7 million Soviet POWs. Of those, 57% died or were killed, a total of 3.6 million.[207] Some of the survivors on their return to the USSR were treated as traitors (see Order No. 270).[208]
Japanese prisoner-of-war camps also had high death rates, many were used as labour camps. The International Military Tribunal for the Far East found the death rate of Western prisoners was 27.1 percent (for American POWs, 37 percent),[209] seven times that of POW's under the Germans and Italians[210] The death rate among Chinese POWs was much larger; a directive ratified on August 5, 1937 by Hirohito declared that the Chinese were no longer protected under international law.[211] While 37,583 prisoners from the UK, 28,500 from the, Netherlands and 14,473 from United States were released after the surrender of Japan, the number for the Chinese was only 56.[212]
According to a joint study of historians featuring Zhifen Ju, Mark Peattie, Toru Kubo, and Mitsuyoshi Himeta, more than 10 million Chinese were mobilized by the Japanese army and enslaved by the Kōa-in for slave labor in Manchukuo and north China.[213] The U.S. Library of Congress estimates that in Java, between 4 and 10 million romusha (Japanese: "manual laborer"), were forced to work by the Japanese military. About 270,000 of these Javanese laborers were sent to other Japanese-held areas in South East Asia. Only 52,000 were repatriated to Java, meaning that there was a death rate of 80%.[214]
On February 19, 1942 Roosevelt signed Executive Order 9066, interning thousands of Japanese, Italians, German Americans, and some emigrants from Hawaii who fled after the bombing of Pearl Harbor for the duration of the war. 150,000 Japanese-Americans were interned by the U.S. and Canadian governments, as well as nearly 11,000 German and Italian residents of the U.S.
Allied use of slave labor occurred mainly in the east, such as in Poland,[215] but more than a million was also put to work in the west. By December 1945 it was estimated by French authorities that 2,000 German prisoners were being killed or maimed each month in mine-clearing accidents.[216]
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