

|
| World War II | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Part of {{{partof}}} | |||||||||||
![]() Clockwise from top: Allied landing on Normandy beaches on D-Day, the gate of a Nazi concentration camp at Auschwitz, Red Army soldiers raising Soviet flag over the Reichstag in Berlin, the Nagasaki atom bomb, the 1936 Nuremberg Rally |
|||||||||||
|
|||||||||||
| Combatants | |||||||||||
| Allied Powers | Axis Powers | ||||||||||
| Commanders | |||||||||||
| {{{commander1}}} | {{{commander2}}} | ||||||||||
| Strength | |||||||||||
| {{{strength1}}} | {{{strength2}}} | ||||||||||
| Casualties | |||||||||||
| 17 million | 7 million | ||||||||||
World War II, also known as the Second World War, was a mid-20th century conflict that engulfed much of the globe and is accepted as the largest and deadliest war in human history. It was the first time that a number of newly developed technologies, including nuclear weapons, were used against either military or civilian targets. World War II resulted in the direct or indirect death of more than 60 million people, over 3% of the world population at that time. Additionally, many millions more received serious and permanently crippling injuries, such as multiple loss of limbs due to enemy gunfire, bomb or artillery explosions, inhumane experiments, and nuclear fallout. It is estimated to have cost more money and resources than all other wars combined: about 1 trillion US dollars in 1945 (adjusted for inflation; roughly 10.5 trillion in 2005), not including subsequent reconstruction. The vast outcomes of the war, including new technology and changes to the world's geopolitical, cultural and, economic arrangement, were unprecedented in human history.
Attributed in varying degrees to the Treaty of Versailles, the Great Depression, and the rise in nationalism, racism, fascism, Nazism, Japanese imperialism, and militarism, the causes of the war are a matter of debate.
The war was fought between the Axis Powers and the Allies. The Axis initially consisted of an alliance between Germany and Italy, which later expanded to include Japan and Eastern European countries such as Romania and Bulgaria. Some of the nations that Germany conquered sent military forces, particularly to the Eastern front. Among the expeditionary forces that joined Germany were forces from Vichy France, Spain (though Spain was itself a neutral country), and armies of Russians and Ukrainians under the command of the general Andrey Vlasov. The Allies initially consisted of the United Kingdom, along with the British Empire and most of the Commonwealth, France, and Poland, later joined (in 1940) by Norway, Belgium and the Netherlands and in 1941 by the USSR and the United States of America. Other notable allies included Brazil and China - which had been engaged in war with Japan since the mid 1930s.
Fighting occurred across the Atlantic Ocean, in Western and Eastern Europe, in the Mediterranean Sea, Africa, the Middle East, in the Pacific and South East Asia, and it continued in China. In Europe, the war ended with the surrender of Germany on 8 May 1945 (V-E and Victory Days), but continued in Asia until Japan surrendered on 15 August 1945 (V-J Day).
Approximately 60 million people died as a result of the war. This figure includes acts of genocide such as the Holocaust and General Ishii Shiro's Unit 731 experiments in Pingfan, incredibly bloody battles in Europe and the Pacific Ocean, and massive bombings of cities, including the atomic bombings of Hiroshima and Nagasaki in Japan and the firebombing of Dresden and Pforzheim in Germany. Few areas of the world were unaffected; the war involved the "home front" and bombing of civilians to a new degree. Atomic weapons, jet aircraft, rockets and radar, the blitzkrieg, (or "lightning war"), the massive use of tanks, submarines, torpedo bombers and destroyer/tanker formations, are only a few of many wartime inventions and new tactics that changed the face of the conflict.
Post–World War II Europe was partitioned into Western and Soviet spheres of influence, the former undergoing economic reconstruction under the Marshall Plan and the latter becoming satellite states of the Soviet Union. This partition was, however, informal; rather than coming to terms about the spheres of influence, the relationship between the victors steadily deteriorated, and the military lines of demarcation finally became the de facto country boundaries. Western Europe largely aligned as NATO, and Eastern Europe largely as the Warsaw pact countries, alliances which were fundamental to the ensuing Cold War. In Asia, the United States' military occupation of Japan led to Japan's democratization. China's civil war continued through and after the war, resulting eventually in the establishment of the People's Republic of China. There was a fundamental shift in power from Western Europe to the new superpowers, the United States and the Soviet Union, though there were few actual boundary changes.
Contents |
Main articles: Causes of World War II, Events preceding World War II in Europe, Events preceding World War II in Asia
The causes of World War II are naturally a debated subject, but a common view, particularly among the allies in the early post-war years, ties them to the policy of appeasement, which was directed by Britain and France after the First World War and expansionism of Germany and Japan: Germany had lost wealth, power and status following the First World War and the expansion was to make Germany great again.
In Germany there was a strong desire to escape the bonds of the World War I Treaty of Versailles, and eventually, Hitler and the Nazis assumed control of the country. They led Germany through a chain of events: rearmament, reoccupation of the Rhineland, a merger with Austria (Anschluss), incorporation of Czechoslovakia and finally the invasion of Poland.
In Asia, Japan's efforts to become a world power and the rise of militarist leadership (in the 1930s the government in Japan was undermined as militarists rose to power and gained de facto totalitarian control) led to conflicts with first China and later the United States. Japan also sought to secure additional natural resources, such as oil and iron ore, due in part to the lack of natural resources on Japan's own home islands.
Main article: Participants in World War II
The belligerents of the Second World War are usually considered to belong to either of the two blocks: the Axis and the Allies. A number of smaller countries participated in the war, some of them under occupation or as proxies of one of the large powers.
Some nations participated on different sides at different times.
The Axis Powers consisted primarily of Germany, Italy, and Japan, which split the Earth into three spheres of influence under the Tripartite Pact of 1940, and vowed to defend one another against aggression. Smaller countries participating on the Axis side were Bulgaria, Romania, Hungary, Slovakia, and (at times) Finland. Spain's fascist government never joined the Axis or took part in the war.
Among the Allied powers, what emerged to be the Big Three were the United Kingdom (from September 3, 1939), the Soviet Union (from June 1941) and the United States (from December 1941). The nations which declared war on Germany in September 1939 included Britain and the Commonwealth, France, and Poland. China had been at war with Japan since 1937.
On August 23, 1939, just before the war broke out, the USSR and Germany signed the non-aggression Molotov-Ribbentrop Pact, which, among other things, divided Eastern Europe into regions of influence. But Germany violated the pact when it invaded the USSR in 1941. Similarly, the US had the (much older) unilateral Monroe Doctrine, which stated that Europe should not interfere in the Americas and in turn the U.S. would not interfere in European affairs (including wars). But the U.S. entered the war after first Japan and then Germany declared war on it and launched direct attacks on its navy, shipping and other interests.
Many other countries, including Australia, Belgium, Brazil, Canada, Denmark, France, Greece, the Netherlands, New Zealand, Norway, the Philippines, Poland, Thailand and Yugoslavia are also considered important Allies, although some of these were conquered and occupied by Axis forces or even officially joined the Axis as a result of coercion.
Countries that attempted to remain neutral in the conflict were often viewed with suspicion by the participants, and often pressured to make contributions to the most influential power in their neighbourhood. Sovereignty was often difficult to maintain as many countries that did not directly participate in the conflict nevertheless held vested interests in seeing a particular side prevail. For example, neutral Switzerland was generally considered to be "Allied-friendly", while neutral Spain was considered "Axis-friendly", despite the fact that neither country openly proclaimed any alliances. Such situations allowed neutral countries to become hotbeds of espionage.
Main articles: European Theatre of World War II, Mediterranean Theatre of World War II, Pacific War, End of World War II in Europe
On which date World War II started is a debated subject; historians do not all agree on which event signified the start of the war. The most common date used is 1 September 1939, marking the German invasion of Poland which resulted in the British and French declarations of war two days later. Other candidates include the Japanese invasion of China on 7 July 1937 (the start of the Second Sino-Japanese War) or the entry of Hitler's armies to Prague in March 1939. Some historians argue that the Italian occupation of Ethiopia (The Second Italo-Abyssinian War) which lasted seven months in 1935-1936 was the actual start of World War II. There are some historians that argue the war started on the Manchurian Incident on 18 September 1931.
On 7 July 1937, Japan, after occupying northeastern China as Manchuria in 1931, launched another attack against China near Beijing (see Marco Polo Bridge Incident). Rather than retreating swiftly as in engagements with the Japanese before, the Chinese government declared war on Japan, marking the official start of the Second Sino-Japanese War, which would soon become part of the World War. In December 1937, the capital city, Nanking (now Nanjing), fell and the Chinese government moved its seat to Chongqing for the rest of the war. Surprised by the unanticipated level of resistance from China, the Japanese forces committed brutal atrocities against civilians and POWs when Nanking was occupied (see Nanjing Massacre), killing up to 200,000 civilians within a month.
In Europe, the peace was uneasy, with Germany annexing Austria and Czechoslovakia, and taking apparent aim at Poland.
Main articles: Polish September Campaign, Phony War
War broke out in Poland on 1 September 1939, with the German invasion of Poland. France and the United Kingdom honoured their defensive alliance of March 1939 by declaring war two days later on 3 September. Australia and New Zealand declared war the same day, although through the quirk of the international date line, New Zealand then Australia were the first to declare war on Germany. Canada followed a week later, on 10 September. Only partly mobilized and with troops inadequately equipped with largely outdated weapons (which included large numbers of horse-mounted cavalry), and without the anticipated support of French or British forces, Poland unsurprisingly fared poorly against the Wehrmacht's superior numbers and "blitzkrieg" tactics, since Germany and German-controlled Czechoslovakia surrounded Poland on three sides. In accordance with the Molotov-Ribbentrop Pact, the Soviet Red Army invaded Poland from the east on 17 September, so the Polish Army was completely surrounded by the Nazi and Soviet forces. Hours later, the Polish government escaped to Romania. The last Polish Army unit was defeated on 6 October. As Poland fell, the British and French were either caught unaware of German intentions or had not allowed themselves to believe that Germany would invade Poland. Germany paused to regroup as the British and French waited for them at the frontline during a period that would be jokingly termed "the Phony War", or the "Sitzkrieg", because no actual fighting was taking place. The "Sitzkrieg" lasted until May 1940. Polish forces continued to fight the Axis powers after their country fell. A prominent example was the assistance of Polish pilots during the Battle of Britain.
The Soviet Union honoured the Molotov-Ribbentrop pact and did not fight the fascists: Stalin was happy to have those he felt were his natural and true enemies—the capitalist West and Nazi Germany—fight each other. Indeed, the Soviets had their agents in the U.S., working alongside Nazi sympathizers, advocate that the U.S. remain neutral in the war, a position that the majority of Americans, reluctant to join in what they saw as "someone else's war," welcomed.
There were isolated engagements during the "Phony War" or "Sitzkrieg" period, including the sinking of HMS Royal Oak in the anchorage at Scapa Flow and Luftwaffe bombings of the naval bases at Rosyth and Scapa Flow. The Kriegsmarine pocket battleship Admiral Graf Spee was sunk in South America after the battle of the River Plate. The Tripartite Pact was signed between Germany, Italy, and Japan on 27 September 1940, formalising their alignment as the "Axis Powers". The Soviet Union invaded Finland on 30 November 1939, beginning the Winter War, which lasted until March 1940 with Finland ceding territory to the Soviet Union.
Main Articles: Norwegian Campaign, Battle of France, Battle of Britain, North African Campaign, Balkans Campaign
Europe: Germany invaded Denmark and Norway on 9 April 1940, in Operation Weserübung, ostensibly to counter the threat of an Allied invasion from the region. Heavy fighting ensued on land and at sea in Norway. British, French and Polish forces landed to support the Norwegians at Namsos, Åndalsnes and Narvik, with most success at the latter. By late June, all Allied forces had been evacuated, and the Norwegian Army surrendered. France, Belgium, the Netherlands and Luxembourg were invaded on 10 May, ending the Phony War and beginning the Battle of France. The Allies had hoped to establish a static continuous front and were ill-prepared for the German Blitzkrieg tactics. In the first phase of the invasion, Operation Yellow, the Wehrmacht's Panzergruppe von Kleist bypassed the Maginot Line and split the Allies in two by driving to the English Channel. Belgium, Luxembourg, and the Netherlands fell quickly against the attack of Army Group B, and the British Expeditionary Force, trapped in the north, was evacuated at Dunkirk in Operation Dynamo. German forces then invaded France itself, in Operation Red, advancing behind the Maginot Line and near the coast. While some units from the French army were still fighting, a number of top politicians and military leaders decided that it would be better to surrender given the situation; France signed an armistice with Germany on June 22, 1940, leading to the establishment of the Vichy France puppet government in the unoccupied part of France.
In June 1940 the Soviet Union occupied Latvia, Lithuania, and Estonia, and annexed Bessarabia and Northern Bukovina from Romania. Not having secured a rapid peace with the United Kingdom, Germany began preparations to invade with the Battle of Britain. Fighter aircraft fought overhead for months as the Luftwaffe and Royal Air Force fought for control of Britain's skies. The Luftwaffe initially targeted RAF Fighter Command but turned to terror bombing London. The Luftwaffe was not successful, and Operation Sealion, the proposed invasion of the British Isles, was abandoned. Similar efforts were made, though at sea, in the Battle of the Atlantic. In a long-running campaign, German U-Boats attempted to deprive the British Isles of necessary Lend Lease cargo from the United States. The U-Boats reduced shipments considerably; however, the United Kingdom refused to seek peace, with Prime Minister Winston Churchill stating that "We shall never surrender". President Roosevelt announced a shift in the American stance from neutrality to "non-belligerency".
The Mediterranean: Italy invaded Greece on 28 October 1940, from bases in Albania. Although outnumbered, Greek forces successfully repelled the Italian attacks and launched a full-scale counter-attack deep into Albania. By mid-December they had liberated one-fourth of Albania. The North African Campaign began in 1940; Italian forces in Libya attacked British forces in Egypt. The aim was to make Egypt an Italian possession, especially the vital Suez Canal. British,