1939 – 1945
The deadliest war in recorded history grew from linked conflicts and imperial expansion in Europe, Africa, and Asia. Japan’s war in China preceded Nazi Germany’s invasion of Poland in September 1939, which was followed by the Soviet invasion from the east under the German-Soviet pact. Axis conquest and occupation produced racial war, forced labor, mass starvation, the Holocaust—the systematic murder of six million Jews—and other genocides and mass atrocities. Allied victory resulted from enormous and unequal contributions across the Soviet, Chinese, European, Mediterranean, Atlantic, African, and Pacific theaters. Germany surrendered in May 1945; Japan surrendered after the atomic bombings, Soviet entry against Japan, blockade, conventional destruction, and internal political decisions. Estimates of roughly 70–85 million dead remain imprecise, with civilians the majority.
Chapter-by-chapter narrative with maps, primary sources, and key events.
Explore battles on a live map with a timeline slider and territory overlays.
Deep-dive into every major engagement — commanders, casualties, significance.
Biographical flip cards with real portraits, facts, and full biography pages.
Trace each figure's full life journey — birth, education, battles, and death — on a live map.
Scroll-driven visualization of casualties — each dot a thousand lives.
Weapons, war machines, and the military innovations that defined how this conflict was fought.
Cause-and-effect chains tracing the war's long shadow on history.
War crimes, massacres, and the darkest chapters of this conflict — documented for history.
The deadliest war in recorded history grew from linked conflicts and imperial expansion in Europe, Africa, and Asia. Japan’s war in China preceded Nazi Germany’s invasion of Poland in September 1939, which was followed by the Soviet invasion from the east under the German-Soviet pact. Axis conquest and occupation produced racial war, forced labor, mass starvation, the Holocaust—the systematic murder of six million Jews—and other genocides and mass atrocities. Allied victory resulted from enormous and unequal contributions across the Soviet, Chinese, European, Mediterranean, Atlantic, African, and Pacific theaters. Germany surrendered in May 1945; Japan surrendered after the atomic bombings, Soviet entry against Japan, blockade, conventional destruction, and internal political decisions. Estimates of roughly 70–85 million dead remain imprecise, with civilians the majority.
World War II was fought from 1939 to 1945.
World War II was fought between Allied Powers and Axis Powers.
An estimated 80,000,000 people died in World War II, including roughly 25,000,000 military and 55,000,000 civilian deaths. Figures are scholarly estimates and vary by source.
Major engagements included Battle of Stalingrad, Siege of Leningrad, Battle of Berlin, and Operation Barbarossa.