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World War II

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World War II was the most extensive and costly armed conflict in the history of the world, involving the great majority of the world's nations, being fought simultaneously in several major theatres, and costing approximately 55.5 million lives (see below). The war was fought mainly between an alliance of the British Commonwealth, France, the United States, the Soviet Union, and China—collectively known as the Allies; and the Axis Powers, an alliance between Germany, Italy, and Japan. Most of the fighting occurred in the Atlantic theatre in and around Europe, and in the Pacific theatre in the Pacific and East Asia.

The German invasion of Poland on September 1, 1939 is the most common date in the West for the start of World War II. Others cite the Japanese invasion of China in 1937 as the war's beginning, or even the 1931 Japanese incursion into Manchuria. The war in Europe ended with the surrender of Germany on May 8, 1945, but continued in Asia and the Pacific until September 2, 1945, when Japan surrendered.

The war was significant in that it was the first war in which air power was a significant factor. Indeed, the first combat operation in World War II was a German bombing attack against Poland, while the last combat operation was a thousand-aircraft bombing attack on Japan, on August 14, 1945. The war also saw the re-emergence of the United States from its isolationism, the destruction and rebuilding of Germany and Japan into major industrial powers, the advent of the atomic bomb, and the emergence of the United States and the Soviet Union as global superpowers. The war also directly led to the United Nations, which was founded by the victorious Allies in order to prevent such a large and destructive conflict from ever happening again.

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[[Battle of Stalingrad

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The war caused more civilian casualties than any war in history. This was partly due to its unprecedented scale, the first uses of mass aerial bombings against civilian populations (a policy initiated by the German Luftwaffe against Poland, and later used more extensively against German cities by the Allies), and the first application of industrial age technology to enable the mass killing of unwanted civilians in extermination camps. In total, World War II caused the deaths of about two percent of the population of the world. (For details, see the list of World War II casualties by country.)

Note: This article is not meant to completely describe all of the causes or events of the Second World War, and is meant only as a guide or general idea. Further detail is available in linked articles.

Table of contents
1 Causes
2 Prelude to War
3 European Theatre
4 The Pacific War
5 African and Middle Eastern Theatre
6 Consequences
7 World War II military history by country
8 Military engagements
9 Defensive lines
10 Political and social aspects of the war
11 Production and logistics
12 Related articles
13 Lists
14 External links
15 References

Causes

Main article: Causes of World War II

The Second World War came about for a variety of reasons. Some of the most commonly mentioned causes include the war reparations demanded of Germany after World War I coupled with the effects of the Great Depression and the lack of raw materials in Japan.

Prelude to War

Main article: Events preceding World War II in Europe

Resentment of the victorious powers' treatment of the Weimar Republic in the aftermath of World War I, and economic difficulties caused by war reparations and the Great Depression, allowed Adolf Hitler's extreme nationalist NSDAP movement to come to power in Germany. Due to the fragile political situation, Hitler could assume emergency power and virtually total control of the country. Defying post-World War I treaties he redeveloped the German military by means of the democratic constitution that then was put aside. He remilitarized the border zone next to France, enforced the re-unification with Austria in the so-called Anschluss, and with Franco-British approval he annexed parts of Czechoslovakia.

In 1922 Benito Mussolini and the Fascist party had risen to power in Italy. Mussolini's Italian fascists shared some ideological goals with the German National socialists or Nazis and although Mussolini distrusted Hitler, the two countries formed an agreement that became known as the "Rome-Berlin Axis" in 1936.

Benito Mussolini (

European Theatre

''Main article: European Theatre of World War II, The end of World War II in Europe

In 1939, Hitler laid claim to parts of Poland and concluded the Molotov-Ribbentrop Pact with the Soviet Union in response to Britain's and France's supportive defense alliance with Poland, of March 1939. The German Wehrmacht then invaded Poland on September 1, and on 3rd September, 1939, Britain and France declared war on Germany. The Polish government collapsed, with President Ignacy Moscicki fleeing into exile on the 18th. Within weeks the Soviet Red Army also invaded Poland, and hostilities ended with French and British troops giving no assistance to the Poles.

The period from the conclusion of the invasion of Poland in October 1939, till the German invasion of Benelux and France in May 1940, became known as the Phony War. The German and Soviet forces were moved from the attack on Poland. The Red Army concentrated on the Baltic countries and on Finland, where the Winter War came in focus of the world's interest in absence of other hostilities. Meanwhile, the Wehrmacht moved to the west and invaded Denmark and Norway in Operation Weserübung. France mobilized and manned its heavily defended border against the Rhine; and the British sent a large expeditionary force to France. Apart from a brief attack by the French across the Rhine there were little hostilities as both sides built up their forces.

In May of 1940 German forces attacked the Low Countries (The Netherlands, Belgium and Luxembourg). The three countries were occupied quickly with all of their governments and monarchs fleeing to London, except for the Belgian king Leopold III who stayed in his country. France was then promptly invaded. The Germans' Blitzkrieg tactics succeeded in defeating the French and British armies in France. The British Expeditionary Force (BEF) evacuated Dunkirk in Operation Dynamo, leaving their heavy equipment behind, and the French government made a peace, which left the Germans in control of the North and the Vichy government in charge of the South.

Luftwaffe was unable to defeat the Royal Air Force in the Battle of Britain and gain the air superiority needed to invade Britain. Instead they began a strategic bombing campaign which the British called the Blitz, and to blockade Britain into submission in the Battle of the Atlantic. Britain failed to succumb to either.

In June 1941 Germany attacked the Soviet Union, with whom they had a non-aggression pact, in Operation Barbarossa, starting what is known in Russia as the Great Patriotic War (ru: Великая Отечественная Война, Velikaya Otechestvennaya Voyna). The Russians were caught largely by surprise and the Wehrmacht initially conquered vast areas of territory, and captured hundreds of thousands of troops. The Soviets withdrew, and managed to move most of their heavy industry away from the front line and re-establish it in more remote areas. Tenacious, sacrificial defense prevented the Germans from capturing Moscow (Hero City) by the time winter set in (see Battle of Moscow). Hitler, expecting the campaign to be over in a few months, had not equipped their armies for winter fighting. Five days after the Soviets launched their counter attack, on December 11, 1941, Germany declared war on the United States following the Attack on Pearl Harbor by Japan - see Asian Theatre.

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, Franklin Delano Roosevelt and Joseph Stalin]]

In spring the German army made further attacks in the Soviet Union, but appeared to be unable to choose between a direct attack on Moscow and the capture of the Caucasian oilfields. Moscow was again spared, and at the end of 1942 the Soviets succeeded in smashing the Axis' front lines in the south, and surrounding the German 6th Army in the Battle of Stalingrad (Hero City). In February 1943 the paltry remnant of the 300,000 man army surrendered. This blunder could have been avoided had Hitler taken Stalingrad when it was empty of Soviet troops; however, he mistakenly believed it was too well defended, setting the stage for the defeat of the 6th Army. In the spring the Wehrmacht was able to restore the front line and make a successful riposte in the Second Battle of Kharkov, but their offensive at the massive Battle of Kursk (July 1943) was so unsuccessful that the Red Army were able to counterattack and regain the ground previously lost. From that time forward the Soviet Union had the initiative in the East. By the early 1944 Red Army reached border of Poland and ended the Siege of Leningrad.

The German disaster at Stalingrad was promptly followed by a disaster of similar importance in Tunisia (see African theatre below), resulting in the loss of the last Axis foothold in North Africa and the capture of a quarter of a million German and Italian POWs (May 1943). Thereafter the Allies used North Africa as a springboard for the invasion of Sicily (July 1943) and mainland Italy (September 1943), which Winston Churchill described as "the soft underbelly of Europe". Italy surrendered, but German troops moved to disarm the Italians and set about defending the country on their own. They established a series of tough defensive lines in mountainous country that was ideally suited to defense, and progress by the Allies was slow.

The Allies invaded Normandy in Operation Overlord on June 6th 1944 and liberated most of France and the Low Countries by the end of the year.

On June 9th Soviet Union began offensive on Karelian Isthmus forcing German co-belligerent Finland out of war. On June 22nd Soviets began Operation Bagration; 2.5 million men and 6,000 tank attack along 1,000 km front, destroying completely German 500,000 men Army Group Centre and taking 350,000 prisoners. Romania surrendered in August and Bulgaria on September. Germans withdrew from Balkans and managed to hold their position in Hungary until February 1945.

After a desperate counteroffensive by the German army in the Ardennes during the Battle of the Bulge in December 1944, the Allies entered Germany in 1945. By now the Soviets had reached the Eastern borders of the German Reich, and her fate was sealed. Red Army captured Vienna April 14th and the final assault on Berlin began on April 16th. As the Russians surrounded Berlin, Hitler and his staff moved into the bunker underneath the Chancellery. There, on April 30th, 1945, Adolf Hitler committed suicide as Russian shells exploded in the Chancellery garden above. It was twelve years and three months since he had become dictator of Germany. He had appointed Admiral Karl Dönitz President of Germany, but one week later the German armed forces surrendered unconditionally on 7 May 1945.

The Pacific War

Main article: Pacific War

The weakening of China, partly through the actions of British colonialism, and the rapid modernization of Japan in the late 19th century were perhaps the first precursors to the Pacific theatre of the war. Japan modernized its military and went to war with China in 1894, winning handily. Western leaders were surprised at the strength shown by the Japanese. Russia, France and Germany united to force Japan to make land concessions to China. In 1904 Russia and Japan would face off in a war in which Japan is victorious. For the first time, a non-Western country had defeated a European power. The repercussions were felt worldwide as colonies saw that with Western technology, the weapons of the West could be used against the colonizers.

In the First World War, Japan joined the Allied powers, but played only a minor role in fighting German colonial forces in East Asia. At the following Paris Peace Conference of 1919, Japan's proposal of amending a "racial equality clause" to the covenant of the League of Nations was rejected by the United States, Britain and Australia. In 1924 the US Congress passed the Exclusion Act that prohibited further immigration from Japan.

In 1933, Japan withdrew from the League of Nations since she was heavily criticized for her actions in China.

In 1940, Japan occupied French Indochina (Vietnam) upon agreement with the French Vichy government, and joined the Axis powers Germany and Italy. These actions intensified Japan's conflict with the United States and the United Kingdom which reacted with an oil boycott.

The Japanese had already invaded China before World War II started in Europe. U.S. President Roosevelt signed an executive order in May of 1940 allowing U.S. military personnel to resign from the service so that they could participate in a covert operation in China. Hence was born the All Volunteer Group, more commonly known as Chennault's Flying Tigers. With the United States and other countries cutting exports to Japan, Japan decided to bomb Pearl Harbor on 7 December 1941 without warning or declaration of war. Severe damage was done to the American Pacific Fleet, although the aircraft carriers escaped as they were at sea. Japanese forces simultaneously invaded the British possessions of Malaya and Borneo and the American occupied Philippines, with the intention of seizing the oilfields of the Dutch East Indies. The British island fortress of Singapore was captured in what Churchill considered one of the most humiliating British defeats of all time.

In May 1942, a Japanese naval attack on Port Moresby, New Guinea which had it succeeded would have put them within striking range of Australia, was thwarted by the Allied navies in the Battle of the Coral Sea, becoming both the first successful opposition to Japanese plans and the first naval battle fought only between aircraft carriers. A month later the U.S. Navy again prevented the invasion of Midway island, this time destroying four Japanese carriers, which Japanese industry could not replace, and putting the Japanese navy on the defensive.

However, in July the Japanese Army attempted an overland attack on Port Moresby, along the rugged Kokoda Track. Australian reservists, many of them of very young and untrained, fought a stubborn rearguard action, until they were relieved by Australian regular troops returning from action in the Middle East.

The Allied leaders had agreed even prior to the American entry to the war that priority should be given to the defeat of Germany. Nonetheless US and Australian forces under General Douglas MacArthur began to attack captured territories, beginning with, against the bitter and determined defense of Japanese troops, Guadalcanal Island. On August 7, 1942 the island was assaulted by United States Marines. In late August and early September, while battle raged on Guadalacanal, Australian and US forces fought off a Japanese amphibious attack on the eastern tip of New Guinea at Milne Bay, the first conclusive defeat suffered by Japanese land forces. US forces triumphed on Guadalcanal in February 1943.

Australian and US forces then strove to retake the occupied parts of New Guinea and the Dutch East Indies. The rest of the Solomon Islands were retaken in 1943, New Britain and New Ireland in 1944. The Philippines were attacked in late 1944 following the Battle of Leyte Gulf.

US and Allied submarines and aircraft also attacked Japanese merchant shipping, depriving Japanese industry of the raw materials she had gone to war to obtain. The effectiveness of this stranglehold increased as the U.S. captured islands closer to the Japanese mainland.

The Nationalist Kuomintang Army under Chiang Kai-shek and the Communist Chinese Army under Mao Zedong both opposed the Japanese occupation of China, but never truly allied against the Japanese. Conflict between Nationalist and Communist forces continued after and, to an extent, even during the war.

Capture by the Allies of islands such as Iwo Jima and Okinawa close to Japan brought the homeland within range of naval and air attacks, Tokyo was firebombed and later an atomic bomb, the "Little Boy", was dropped from the Enola Gay and destroyed Hiroshima. On August 8, 1945 the Soviet Union declared war on Japan, attacking her possessions in Manchuria. On August 9th, in Nagasaki, another atom bomb, "Fat Man" was dropped by the B-29 Bock's Car. The Japanese surrendered on August 14, 1945, signing official surrender papers on September 2, 1945 aboard the USS Missouri.

African and Middle Eastern Theatre

The North African Campaign began in 1940, when small British forces in Egypt turned back an Italian advance from Libya. This advance was stopped in 1941 when German forces under Erwin Rommel landed in Libya. In addition, in June 1941 the Australian Army and allied forces invaded Syria and Lebanon, capturing Damascus on June 17. Rommel's Afrika Korps advanced rapidly eastward, laying siege to the vital seaport of Tobruk. The Australian and British troops in the city resisted all until relieved, but a renewed Axis offensive captured the city and drove the Eighth Army back to a line at El Alamein.

The First Battle of El Alamein took place between July 1 and July 27, 1942. German forces had advanced to the last defensible point before Alexandria and the Suez Canal. However they had outrun their supplies, and a British and Commonwealth defense stopped their thrusts. The Second Battle of El Alamein occurred between October 23 and November 3, 1942 after Bernard Montgomery had replaced Claude Auchinleck as commander of the Eighth Army. Commonwealth forces took the offensive and destroyed the Afrika Korps. Rommel was pushed back, and this time did not stop falling back until Tunisia.

To complement this victory, on 8 November, 1942, American and British troops landed in Morocco and Algeria in Operation Torch. The local forces of Vichy France put up limited resistance before joining the Allied cause. Ultimately German and Italian forces were caught in the pincers of a twin advance from Algeria and Libya. Advancing from both the east and west, the Allies completely pushed the Wehrmacht out of Africa and on May 13, 1943, the remnants of the Axis forces in North Africa surrendered. 250,000 prisoners were taken; as many as at Stalingrad.

North Africa was used as the jumping-off point for the invasions of Sicily and Italy in 1943.

Consequences

In contrast to World War I, the Western victors in the Second World War did not demand compensation from the defeated nations. On the contrary, a plan created by U. S. Secretary of State George Marshall, the "Economic Recovery Program", better known as the Marshall Plan, called for the U.S. Congress to allocate billions of dollars for the reconstruction of Europe.

Since the League of Nations had obviously failed to prevent the war, a new international order was constructed. In 1945 the United Nations was founded.

The portion of Europe occupied or dominated by the Soviet Union did not benefit from the Marshall Plan. In the Paris Peace Treaty, the Soviet Union's enemies Hungary, Finland and Romania were required to pay war reparations of $300,000,000 each (in 1938 dollars) to the USSR and her satellites (both Hungary and Romania became satellites of the Soviet Union). Italy was required to pay $360,000,000, shared chiefly between Greece, Yugoslavia and the Soviet Union.

In the areas occupied by the Soviet Union at the end of the war, puppet regimes were installed, over the objections of the other Allies and the governments in exile. Germany was partitioned into four zones of occupation, with the American, British and French zones grouped as West Germany and the Soviet zone becoming a Soviet satellite state, called East Germany. Austria was once again separated from Germany and it, too, was divided into four zones of occupation, but the Soviet zone was eventually submerged into a re-united state of Austria. In Churchill's words, "an Iron Curtain has descended across Europe". In due course this would lead to a commitment from America to help protect Western Europe, the formation of NATO and the Cold War.

The repatriation, pursuant to the terms of the Yalta Conference, of two million Russian soldiers who had came under the control of advancing American and British forces, resulted for the most part in their deaths.

The massive research and development involved in the Manhattan Project in order to quickly achieve a working nuclear weapon design greatly impacted the scientific community, among other things creating a network of national laboratories in the United States. In addition, the pressing for numerous calculations for various things like ballistics tables kickstarted the development of electronic computer technology.

In the military sphere, World War II marked the coming of age of airpower, mostly at the expense of warships. While the pendulum continues to swing in this never-ending competition, air powers are now a full partner in any military action. World War II also saw the creation of guided missiles which, like airpower, are now used in virtually every conflict.

The war was the high-water mark for mass armies. While huge armies of low-quality troops would be seen again (during the Korean War and in a number of African conflicts), after this victory the major powers relied upon small highly-trained and well-equipped militaries.

After the war, many high-ranking Germans were prosecuted for war crimes, as well as the mass murder of the Holocaust committed mainly on the area of General Government, in the Nuremberg trials. Similarly Japanese leaders were prosecuted in the Tokyo War Crime Trial. In other countries, notably in Finland, the Allies demanded the political leadership to be prosecuted in "war-responsibility trials" - i.e. not for crimes of war.

The defeat of Japan, and her occupation by American Forces, led to a westernization of Japan that was surely more far-reaching than would otherwise have occurred. Japan approximated more closely to a Western style democracy and, because of her defeat by the USA, set out to imitate the United States. This huge national effort led to the post-war Japanese economic miracle and Japan's rise to become the world's second largest economy.

World War II military history by country

Military engagements

Battles

Sieges

Naval engagements

Major bombing campaigns

See also Strategic bombing survey for the overall impact of the bombing.

Defensive lines

Political and social aspects of the war

Production and logistics

The Axis lost, at least partly because the Allies, after the USA's and the Soviet Union's entrance into the war, had greater productive resources, and were able to turn these resources into greater numbers of soldiers and weapons than the Axis.

Related articles

Lists

External links

References