World War II Lasted From 1939 to 1945
It began with Germany's invasion of Poland on September 1, 1939, and ended with Japan's surrender in September 1945.
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Polish and British Codebreakers Broke the Enigma Cipher
Marian Rejewski's early work was built upon at Bletchley Park.
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The Manhattan Project Built the First Atomic Bombs
Bombs were dropped on Hiroshima and Nagasaki in August 1945.
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D-Day Was the Largest Seaborne Invasion in History
Allied forces landed in Normandy on June 6, 1944.
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World War II Killed an Estimated 70 to 85 Million People
It was the deadliest conflict in human history.