World war 2

World War II, or the Second World War,^[1] (often abbreviated WWII or WW2) was a global military conflict which involved a majority of the world's nations, including all of the great powers,^[2] organised into two opposing military alliances: the Allies and the Axis. The war involved the mobilisation 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 seventy million people, the majority of them civilians, were killed, making it the deadliest conflict in human history.^[3]
The start of the war is generally held to be in September 1939 with the German invasion of Poland and subsequent declarations of war on Nazi Germany by the British Commonwealth and France.^[4][5] Many belligerents entered the war before or after this date, during a period which spanned from 1937 to 1941, as a result of other events. Amongst these main events are the Marco Polo Bridge Incident (fought between Nationalist China and Japan), the start of Operation Barbarossa (the Nazi invasion of Russia), and the attacks 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 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

In the aftermath of World War I, a defeated Germany signed the Treaty of Versailles.^[6] This caused Germany to lose a significant portion of its territory, prohibited the annexation of other states, limited the size of German armed forces and imposed massive reparations. Russia's civil war led to the creation of the Soviet Union which soon was under the control of Joseph Stalin. In Italy, Benito Mussolini seized power as a fascist dictator promising to create a "New Roman Empire."^[7] The Kuomintang (KMT) party in China launched a unification campaign against regional warlords and nominally unified China in the mid-1920s, but was soon embroiled in a civil war against its former Chinese communist allies. In 1931, an increasingly militaristic Japanese Empire, which had long sought influence in China^[8] as the first step of its right to rule Asia, used the Mukden Incident as justification to invade Manchuria; the two nations then fought several small conflicts, in Shanghai, Rehe and Hebei until the Tanggu Truce in 1933. Afterwards Chinese volunteer forces continued the resistance to Japanese aggression in Manchuria, and Chahar and Suiyuan.
German troops at the 1935 Nuremberg Rally.



Adolf Hitler, after an unsuccessful attempt to overthrow the German government in 1923, became the leader of Germany in 1933. He abolished democracy, espousing a radical racially motivated revision of the world order, and soon began a massive rearming campaign.^[9] This worried France and the United Kingdom, who had lost much in the previous war, as well as Italy, which saw its territorial ambitions threatened by those of Germany.^[10] To secure its alliance, the French allowed Italy a free hand in Ethiopia, which Italy desired to conquer. The situation was aggravated in early 1935 when the Saarland was legally reunited with Germany and Hitler repudiated the Treaty of Versailles, speeding up remilitarisation and introducing conscription. Hoping to contain Germany, the United Kingdom, France and Italy formed the Stresa Front. The Soviet Union, concerned due to Germany's goals of capturing vast areas of eastern Europe, concluded a treaty of mutual assistance with France.
Before taking effect though, the Franco-Soviet pact was required to go through the bureaucracy of the League of Nations, rendering it essentially toothless^[11][12] and in June 1935, the United Kingdom made an independent naval agreement with Germany easing prior restrictions. The United States, concerned with events in Europe and Asia, passed the Neutrality Act in August.^[13] In October, Italy invaded Ethiopia, with Germany the only major European nation supporting her invasion. Italy then revoked objections to Germany's goal of making Austria a satellite

In direct violation of the Versailles and Locarno treaties, Hitler remilitarized the Rhineland in March 1936. He received little response from other European powers.^[15] When the Spanish Civil War broke out in July, Hitler and Mussolini supported fascist Generalísimo Francisco Franco's nationalist forces in his civil war against the Soviet-supported Spanish Republic. Both sides used the conflict to test new weapons and methods of warfare^[16] and the nationalists would prove victorious in early 1939.
With tensions mounting, efforts to strengthen or consolidate power were made. In October, Germany and Italy formed the Rome-Berlin Axis and a month later Germany and Japan, each believing communism and the Soviet Union in particular to be a threat, signed the Anti-Comintern Pact, which Italy would join in the following year. In China, the Kuomintang and communist forces agreed on a ceasefire to present a united front to oppose Japan.^[17]

The start of the war is generally held to be in September 1, 1939 with the German invasion of Poland. Other dates for the beginning of war include the Japanese invasion of Manchuria in 1931,^[18][19] the start of the Second Sino-Japanese War in 1937,^[20][21] or one of several other events. Other sources follow A. J. P. Taylor, who holds that there was a simultaneous Sino-Japanese War in East Asia, and a Second European War in Europe and her colonies, but they did not become a World War until they merged in 1941; at which point the war continued until 1945. This article uses the conventional dating.^[22]
The end of the War also has several dates. Some sources end it from the armistice of August 14, 1945, rather than the formal surrender of Japan (September 2, 1945); in some European histories, it ended on V-E Day (May 8, 1945). The Treaty of Peace with Japan was not signed until 1951.

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