HistoVisual

Modern - 1 September 1939 - 2 September 1945

World War II

Duration

6 years

Location

Europe, North Africa, Atlantic, Pacific, East Asia

Total Dead

~70-85 million dead

Wounded

~35 million wounded

World War II was a global conflict fought between the Axis and Allied powers. It began in Europe with Germany's invasion of Poland, expanded into Africa and the Atlantic, and became fully global after Japan's war in Asia and attack on Pearl Harbor brought the United States into the conflict.

Geography & Alliances

Factions & Territories

Territory shading uses WWII-era approximations on modern borders; occupied and contested zones are simplified.

Allied Powers

  • United Kingdom
  • Soviet Union
  • United States
  • China
  • France
  • Canada
  • Australia
  • Poland
  • New Zealand
  • British Raj
  • Greece

Axis Powers

  • Germany
  • Italy
  • Japan
  • Hungary
  • Romania
  • Bulgaria

Origins

Causes

1

Revisionism after World War I

The post-1918 order left deep political and economic grievances, especially in Germany, fueling revanchist and extremist movements.

2

Expansionist fascist ideology

Nazi Germany, Fascist Italy, and Imperial Japan pursued territorial conquest, militarization, and authoritarian rule as state doctrine.

3

Weak collective security

The League of Nations failed to deter aggression in Manchuria, Ethiopia, and Central Europe, undermining diplomatic enforcement.

4

Appeasement and delayed deterrence

Concessions to early territorial demands were intended to avoid war but instead encouraged further expansion.

5

Economic instability and militarization

Depression-era disruption and rearmament programs intensified strategic competition and made war preparations politically acceptable.

Human Cost

Casualties

~70-85 million dead

Total Dead

~21-25 million military dead

Military

~45-55 million civilians

Civilian

~35 million wounded

Wounded

Chronology

Timeline

1 September 1939 Event

Germany Invades Poland

German forces invaded Poland; Britain and France declared war days later.

1940 Event

Fall of France and Battle of Britain

Germany overran much of Western Europe but failed to defeat Britain in the air.

22 June 1941 Event

Operation Barbarossa

Germany invaded the Soviet Union, opening the largest land campaign of the war.

7 December 1941 Event

Pearl Harbor

Japan attacked U.S. forces in Hawaii; the United States entered the war.

1942 Event

Midway and El Alamein

Allied victories in the Pacific and North Africa halted further Axis expansion.

1942-1943 Event

Stalingrad Turns the Eastern Front

Soviet forces encircled and defeated German armies, reversing momentum in the East.

1943 Event

Allied Invasion of Italy

Sicily and mainland campaigns removed Mussolini and tied down Axis resources.

6 June 1944 Event

D-Day in Normandy

Allied landings established the Western Front in occupied France.

1944 Event

Liberation Advances

Allied armies advanced across France and the Low Countries while Soviet offensives pushed westward.

8 May 1945 Event

Victory in Europe (VE Day)

Germany surrendered unconditionally after Berlin fell.

August 1945 Event

Hiroshima and Nagasaki

The United States dropped atomic bombs on Hiroshima and Nagasaki.

2 September 1945 Event

Japanese Surrender (VJ Day)

Japan formally surrendered, ending World War II.

Combat

Major Battles

Battle of Britain

1940

Airspace over Britain

Allied defensive victory

Germany failed to gain air superiority, preventing an invasion of Britain and preserving a major Allied base in Western Europe.

Operation Barbarossa

1941

Soviet Union

Axis initial advances

Germany opened the vast Eastern Front, turning the war into a prolonged attritional conflict that strained Axis logistics.

Battle of Moscow

1941-1942

Moscow region, Soviet Union

Allied defensive victory

Soviet defenses and winter counteroffensives halted Germany's first major drive on the Soviet capital.

Attack on Pearl Harbor

1941

Oahu, Hawaii, United States

Axis tactical victory, Allied strategic mobilization

Japan's surprise attack pushed the United States into World War II and transformed the conflict into a fully global war.

Siege of Leningrad

1941-1944

Leningrad (Saint Petersburg), Soviet Union

Allied defensive victory

One of the longest and deadliest sieges in history, it tied down major Axis forces and became a symbol of Soviet endurance.

Battle of Midway

1942

North Pacific Ocean

Allied victory

The U.S. Navy destroyed key Japanese carriers and shifted the strategic initiative in the Pacific.

First Battle of El Alamein

1942

Egypt

Allied defensive stand

Prevented Axis capture of Egypt and the Suez route.

Second Battle of El Alamein

1942

Egypt

Allied victory

Marked a sustained Allied turnaround in North Africa.

Battle of Stalingrad

1942-1943

Stalingrad (Volgograd), Soviet Union

Allied victory

A decisive turning point on the Eastern Front that destroyed a major German army.

Battle of Kursk

1943

Kursk, Soviet Union

Allied victory

The largest tank battle in history ended Germany's ability to launch major strategic offensives in the East.

Guadalcanal Campaign

1942-1943

Solomon Islands

Allied victory

The first major sustained Allied offensive in the Pacific blunted Japanese expansion and shifted momentum.

Battle of the Atlantic

1939-1945

North Atlantic Ocean

Allied victory

Protecting Atlantic convoys ensured troops, fuel, and materiel could reach Britain and later continental Europe.

Battle of Monte Cassino

1944

Cassino, Italy

Allied victory

Broke key German defensive lines in Italy and opened the route toward Rome.

Battle of Normandy (D-Day)

1944

Normandy, France

Allied victory

Opened a major Western Front and accelerated liberation of occupied Europe.

Battle of the Bulge

1944-1945

Ardennes, Belgium and Luxembourg

Allied victory

Germany's final large western offensive failed, exhausting critical reserves.

Battle of Leyte Gulf

1944

Philippine Sea, near Leyte

Allied victory

The largest naval battle in history destroyed much of Japan's remaining naval striking power.

Battle of Berlin

1945

Berlin, Germany

Allied victory

Final major European battle that led directly to Germany's surrender.

Battle of Iwo Jima

1945

Iwo Jima, Japan

Allied victory

Provided a critical base for U.S. air operations and symbolized the high human cost of Pacific island warfare.

Battle of Okinawa

1945

Okinawa, Japan

Allied victory

The largest amphibious battle in the Pacific demonstrated the likely cost of invading the Japanese home islands.

Atomic Bombing of Hiroshima

1945

Hiroshima, Japan

United States strategic bombing

First wartime use of an atomic weapon, causing massive immediate and long-term civilian casualties and accelerating Japan's collapse.

Atomic Bombing of Nagasaki

1945

Nagasaki, Japan

United States strategic bombing

Second atomic bombing in history; together with the Soviet entry into the war against Japan, it preceded Japan's surrender.

Leaders & Commanders

Key Figures

Allied Powers

WC

Winston Churchill

British Prime Minister and central Allied leader

FD

Franklin D. Roosevelt

U.S. President for most of the war

HS

Harry S. Truman

U.S. President at the war's end

JS

Joseph Stalin

Soviet leader directing the Eastern Front war effort

GZ

Georgy Zhukov

Soviet marshal commanding decisive offensives

DD

Dwight D. Eisenhower

Supreme Allied Commander in Western Europe

BM

Bernard Montgomery

British field marshal in North Africa and Europe

CD

Charles de Gaulle

Leader of Free France

Axis Powers

AH

Adolf Hitler

German dictator and architect of Nazi war policy

ER

Erwin Rommel

German field marshal in North Africa and France

BM

Benito Mussolini

Fascist leader of Italy

HT

Hideki Tojo

Japanese wartime prime minister

IY

Isoroku Yamamoto

Japanese admiral and planner of Pearl Harbor

Innovation

Technologies of War

Radar Networks

Radar transformed detection and interception, especially during air defense campaigns.

Aircraft Carriers

Carrier groups replaced battleships as decisive naval strike platforms.

Strategic Bombing

Long-range bombing campaigns targeted industry, logistics, and urban infrastructure.

Amphibious Warfare Doctrine

Large-scale amphibious operations became central to Allied offensives in Europe and the Pacific.

Advanced Armor and Combined Arms

Tanks, mechanized infantry, artillery, and air support were integrated at scale.

Signals Intelligence and Codebreaking

Intelligence from decrypted communications significantly influenced campaign timing and targeting.

Rocket Technology

German V-weapons introduced ballistic and cruise missile warfare concepts.

Atomic Weapons

Nuclear weapons were used in war for the first time in 1945, fundamentally altering strategy.

Legacy

Historical Significance

The war reshaped the modern world: Axis regimes in Germany, Italy, and Japan were defeated; the United Nations was founded; genocide and war crimes were prosecuted in international tribunals; and the postwar balance of power shifted toward a U.S.-Soviet rivalry that became the Cold War.

Consequences

United Nations Established

The UN was founded to provide a new structure for collective security and diplomacy.

Nuremberg and Tokyo Trials

International tribunals prosecuted crimes against humanity, war crimes, and aggressive war.

Europe Rebuilt and Reordered

Massive reconstruction, border adjustments, and political realignment transformed the continent.

Beginning of the Cold War

U.S.-Soviet rivalry replaced wartime alliance and shaped global geopolitics for decades.

Decolonization Accelerated

Imperial powers weakened, and anti-colonial independence movements gained force worldwide.

Division of Germany

Postwar occupation zones evolved into separate East and West German states.

Bretton Woods Economic Order

New financial institutions and monetary arrangements shaped postwar global economics.

Human Rights Frameworks Expanded

Postwar legal and moral responses to atrocities influenced later human-rights institutions.

Did You Know?

Facts

Fact 1

Largest Conflict in Human History

More than 100 million military personnel were mobilized in a war spanning multiple continents.

Fact 2

Civilian Deaths Surpassed Military Deaths

Occupation policies, genocide, bombing, famine, and forced labor drove enormous civilian losses.

Fact 3

Eastern Front Was the Largest Theater

The Soviet-German front produced some of the highest casualties and largest land battles in history.

Fact 4

Atlantic Convoys Were Strategic Lifelines

Securing transatlantic shipping was essential for sustaining Allied operations in Europe.

Fact 5

Pacific War Covered Vast Distances

Naval and air operations unfolded across enormous oceanic theaters and island chains.

Fact 6

Holocaust and Systematic Genocide

Nazi Germany and collaborators murdered millions, including six million Jews.

Fact 7

Women in War Industries and Uniform

Women entered industrial production and military support roles at unprecedented scale.

Fact 8

Atomic Age Began in Wartime

The bombings of Hiroshima and Nagasaki introduced nuclear weapons into global strategy.

See Also

Related Sites

"Never in the field of human conflict was so much owed by so many to so few."

Winston Churchill, speech on the RAF, 20 August 1940