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	'''World War II''', also called the '''Second World War''', was a global war fought from 1939 to 1945. It involved most of the world's major powers and was fought across Europe, Africa, Asia, the Atlantic, the Pacific, and other theatres.

World War II (1939-1945) was a global conflict that involved many nations and had far-reaching consequences for the world. It was the deadliest and most extensive war in human history, resulting in the loss of millions of lives and significant geopolitical changes. This wiki page provides an overview of World War II, including its causes, major events, key leaders, and its impact on societies and subsequent world history.
	The war was fought mainly between the Allies and the Axis powers. The Allies included the United Kingdom, the Soviet Union, the United States, China, and many other states. The Axis powers were led by Nazi Germany, Fascist Italy, and Imperial Japan.

== Causes of World War II ==
Several factors contributed to the outbreak of World War II, including:
	The Second World War was the deadliest conflict in history. It caused tens of millions of deaths, destroyed cities, displaced large populations, exposed the full scale of the Holocaust, and reshaped international politics after 1945.

# Treaty of Versailles: The harsh terms imposed on Germany after World War I, as outlined in the Treaty of Versailles, created resentment and economic hardships that laid the groundwork for future conflicts.
# Expansionist Ambitions: The aggressive expansionist policies of fascist regimes, particularly Nazi Germany under Adolf Hitler and Italy under Benito Mussolini, sought to acquire territory and influence through military force.
# Appeasement: The policy of appeasement pursued by the international community, especially regarding Hitler's territorial ambitions, failed to deter aggression and allowed for further expansion.
# Economic Turmoil: The Great Depression of the 1930s created economic instability, poverty, and unemployment, providing fertile ground for extremist ideologies and nationalist movements.
	== Background ==
	The causes of the war were complex. They included the settlement after the First World War, economic instability, imperial ambition, fascist expansion, militarism, weak collective security, and the failure of appeasement to stop German aggression.

== Major Events ==
World War II was characterized by a series of significant events that shaped its course and outcome:
	Nazi Germany sought territorial expansion in Europe and built its state around dictatorship, racial ideology, antisemitism, and military force. Fascist Italy pursued empire in the Mediterranean and Africa. Imperial Japan expanded in East Asia and the Pacific, including war in China from 1937.

# Invasion of Poland: On September 1, 1939, Germany invaded Poland, marking the beginning of the war in Europe.
# Blitzkrieg and Fall of France: Germany employed the tactic of blitzkrieg, lightning-fast warfare, to swiftly defeat France and other European nations.
# Battle of Britain: The Battle of Britain (1940) saw the Royal Air Force (RAF) successfully repel German air attacks, preventing the planned invasion of Britain.
# Operation Barbarossa: In June 1941, Germany launched a massive invasion of the Soviet Union, opening the Eastern Front.
# Pearl Harbor: On December 7, 1941, Japan's surprise attack on the United States' naval base at Pearl Harbor brought the U.S. into the war.
# D-Day and Allied Invasion: On June 6, 1944, Allied forces launched the largest amphibious invasion in history, landing on the beaches of Normandy, France.
# Battle of Stalingrad: The Battle of Stalingrad (1942-1943) was a turning point, resulting in a significant German defeat and turning the tide of the war in favor of the Allies.
# Atomic Bombings: The United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki in August 1945, leading to Japan's surrender and the end of the war.
	The League of Nations proved unable to stop aggression in the 1930s. Germany remilitarised the Rhineland, annexed Austria, and took the Sudetenland before occupying the rest of Czechoslovakia. The invasion of Poland on 1 September 1939 led Britain and France to declare war on Germany.

== Key Leaders ==
Several prominent leaders emerged during World War II, shaping its course and strategies:
	== War in Europe ==
	Germany defeated Poland quickly and then turned west. In 1940 Germany invaded Denmark, Norway, the Netherlands, Belgium, Luxembourg, and France. France fell in June 1940, leaving Britain and its empire to continue the war in the west.

* [[Adolf Hitler]]: German dictator and leader of the Nazi Party, known for his aggressive expansionist policies.
* [[Winston Churchill]]: Prime Minister of the United Kingdom, who led the country's resistance against Nazi Germany.
* [[Joseph Stalin]]: Soviet leader, who played a significant role in the Soviet Union's war efforts against Germany.
* [[Franklin D. Roosevelt]]: President of the United States during most of the war, providing leadership and support to the Allies.
* [[Emperor Hirohito]]: Emperor of Japan during the war, whose government pursued aggressive military campaigns in the Pacific.
	The Battle of Britain followed. The Royal Air Force resisted German air attacks and helped prevent a German invasion of Britain. The war then spread through bombing campaigns, the Battle of the Atlantic, North Africa, the Balkans, and the Mediterranean.

== Impact and Legacy ==
World War II had profound consequences that shaped the post-war world:
	In June 1941 Germany invaded the Soviet Union in Operation Barbarossa. The Eastern Front became the largest and bloodiest theatre of the war in Europe. Major battles included Moscow, Stalingrad, Kursk, Leningrad, and the final Soviet advance into Germany.

# Human Casualties: The war resulted in the loss of an estimated 70-85 million lives, including civilian and military casualties.
# Holocaust and Genocide: The systematic genocide of six million Jews, along with other groups, by Nazi Germany during the Holocaust remains one of the darkest chapters in human history.
# Geopolitical Changes: The war reshaped the global balance of power, leading to the emergence of the United States and the Soviet Union as superpowers.
# Formation of the United Nations: The United Nations was established in 1945 as an international organization aimed at preventing future conflicts and promoting global cooperation.
# Cold War: The war set the stage for the subsequent Cold War between the United States and the Soviet Union, characterized by political tension and the threat of nuclear warfare.
# Technological Advances: World War II witnessed significant technological advancements, including the development of atomic weapons, radar, jet propulsion, and computers.
	On 6 June 1944 Allied forces landed in Normandy on D-Day. The campaign opened a western front in France and was followed by the liberation of Paris, the advance into Germany, and Germany's surrender in May 1945.

	== War in Asia and the Pacific ==
	Japan had already been fighting in China before the wider Pacific War began. On 7 December 1941 Japan attacked Pearl Harbor and also struck British, Dutch, and American possessions across the Pacific and South East Asia.

	The United States entered the war after Pearl Harbor. The Pacific War involved naval battles, island campaigns, air war, submarine warfare, occupation, resistance, and severe civilian suffering in areas under Japanese control.

	Key moments included the Battle of Midway, the Guadalcanal campaign, the Burma campaign, the Philippines campaign, Iwo Jima, Okinawa, and the strategic bombing of Japan. The war ended after the Soviet Union entered the war against Japan and the United States used atomic bombs against Hiroshima and Nagasaki in August 1945. Japan announced surrender on 15 August 1945 and formally surrendered on 2 September 1945.

	== The Holocaust and Other Atrocities ==
	The Holocaust was the systematic persecution and murder of approximately six million Jews by Nazi Germany and its collaborators. Other victims of Nazi persecution included Roma and Sinti people, disabled people, Polish and Soviet civilians, prisoners of war, political opponents, gay men, Jehovah's Witnesses, and others targeted by Nazi policy.

	The war also included mass murder, forced labour, starvation, deportation, reprisals, war crimes, and sexual violence in multiple theatres. Japanese forces committed atrocities in China and elsewhere, including the Nanjing Massacre and brutal treatment of prisoners of war and civilians.

	The scale of these crimes shaped post-war law, memory, human rights politics, and the development of genocide studies.

	== Home Fronts ==
	The war depended on industrial production, rationing, civil defence, propaganda, scientific research, and the mobilisation of civilian labour. Women entered war work in large numbers, while occupied societies faced collaboration, resistance, forced labour, deportation, hunger, and repression.

	Bombing campaigns affected many cities. Britain experienced the Blitz. Germany, Japan, Poland, the Soviet Union, China, and other countries suffered large-scale destruction. Civilian life was often marked by rationing, fear, family separation, and displacement.

	== Technology and Warfare ==
	The Second World War accelerated military and scientific development. Radar, sonar, codebreaking, aircraft production, tanks, amphibious warfare, rockets, jet aircraft, medicine, logistics, computing, and nuclear physics all changed during the conflict.

	Technology did not decide the war by itself. Industrial capacity, geography, manpower, intelligence, alliances, command decisions, logistics, and political will all mattered. The war showed how modern states could combine science, industry, and mass mobilisation on a destructive scale.

	== End and Aftermath ==
	Germany surrendered in May 1945. Japan surrendered in August 1945 and signed the formal instrument of surrender in September. The end of the war left much of Europe and Asia devastated.

	The aftermath included occupation, reconstruction, war crimes trials, decolonisation, population transfers, refugee crises, and the division of Europe. The United States and the Soviet Union emerged as rival superpowers, leading into the Cold War.

	The United Nations came into existence on 24 October 1945 after its Charter was ratified. It was created in the aftermath of war with the aim of preventing future conflict and providing a framework for international cooperation.

	== Legacy ==
	The Second World War remains central to modern history. It shaped borders, institutions, alliances, military strategy, human rights law, nuclear politics, Holocaust remembrance, and national memory across many countries.

	The war is also heavily mythologised. Serious study has to separate memory, propaganda, national pride, and later political use from the historical record. Its scale makes it impossible to reduce to one front, one country, or one cause.

	== See Also ==
	* [[Adolf_Hitler]]
	* [[British_Empire]]
	* [[United_States]]
	* [[Human_Rights]]

	== References ==
	* [https://www.iwm.org.uk/history/second-world-war Imperial War Museums: Second World War]
	* [https://www.nam.ac.uk/explore/second-world-war National Army Museum: Second World War]
	* [https://encyclopedia.ushmm.org/content/en/article/introduction-to-the-holocaust United States Holocaust Memorial Museum: Introduction to the Holocaust]
	* [https://www.un.org/en/about-us/history-of-the-un United Nations: History of the United Nations]
	* [https://dcas.dmdc.osd.mil/dcas/app/conflictCasualties/ww2 DCAS: World War II casualties]
	* [https://www.nationalww2museum.org/students-teachers/student-resources/research-starters/research-starters-worldwide-deaths-world-war National WWII Museum: Worldwide deaths in World War II]

	[[Category:History]]
	[[Category:War]]
	[[Category:Politics]]