World War II, or the
Second World War[1] (often abbreviated as
WWII or
WW2), was a global military conflict lasting from 1939 to 1945, which involved
most of the world's nations, including all of the
great powers: eventually forming two opposing military alliances, the
Allies and the
Axis. It was the most widespread war in history, with more than 100 million military personnel mobilised. In a state of "
total war,"
the major participants placed their entire economic, industrial, and
scientific capabilities at the service of the war effort, erasing the
distinction between civilian and military resources. Marked by
significant events involving the mass death of civilians, including the
Holocaust and the
only use of nuclear weapons in warfare, it was the
deadliest conflict in
human history,
[2] resulting in
50 million to over 70 million fatalities.

The war is generally accepted to have begun on 1 September 1939, with the
invasion of
Poland by
Germany, and subsequent
declarations of war on Germany by
France and most of the countries of the
British Empire and
Commonwealth. Germany set out to establish a large empire in Europe. From late 1939 to early 1941, in a series of campaigns and
treaties, Germany conquered or subdued much of continental Europe; amid
Nazi-Soviet agreements,
the nominally neutral Soviet Union fully or partially occupied and
annexed territories of its six European neighbours. Britain and the
Commonwealth remained the only major force continuing the fight against
the Axis in
North Africa and in extensive
naval warfare. In June 1941, the European Axis launched an invasion of the Soviet Union, giving a start to the
largest land theatre of war in history, which, from that moment on, tied down the major part of the Axis military power. In December 1941,
Japan, which had been
at war with
China since 1937,
[3] and aimed to dominate
Asia,
attacked the United States and
European possessions in the
Pacific Ocean, quickly conquering much of the region.

The Axis advance was stopped in 1942 after the defeat of Japan in a series of
naval battles and after defeats of European Axis troops in
North Africa and,
decisively, at
Stalingrad. In 1943, with a series of
German defeats in
Eastern Europe, the
Allied invasion of
Fascist Italy,
and American victories in the Pacific, the Axis lost the initiative and
undertook strategic retreat on all fronts. In 1944, the Western Allies
invaded France, while the Soviet Union regained all territorial losses and invaded Germany and its allies.
The war in Europe ended with the
capture of Berlin by Soviet and Polish troops and the subsequent
German unconditional surrender on
8 May 1945. The Japanese Navy was
defeated by the United States, and invasion of the
Japanese Archipelago ("Home Islands") became imminent. The war in Asia ended on 15 August 1945 when Japan agreed to surrender.

The war ended with the total victory of the Allies over Germany and
Japan in 1945. World War II altered the political alignment and social
structure of the world. The
United Nations
(UN) was established to foster international cooperation and prevent
future conflicts. The Soviet Union and the United States emerged as
rival
superpowers, setting the stage for the
Cold War, which lasted for the next 46 years. Meanwhile, the influence of European great powers started to decline, while the
decolonisation of Asia and
Africa began. Most countries whose industries had been damaged moved towards
economic recovery. Political integration, especially
in Europe, emerged as an effort to stabilise postwar relations.
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