HOW STUFF WORKS
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Can you guess if these events happened in WWI or WWII?
by John Miller
Two World Wars. Two generations shattered by conflict. Sometimes, we confuse the details of these great wars. Read our clues and then decide -- was it World War I or World War II?

Which was became famous for siege-like trench warfare?

  • WWI
  • WWII

"Blitzkrieg" combat was common during this conflict.

  • WWI
  • WWII

In which war did Japan fight on the side of the Allies?

  • WWI
  • WWII

Italian leader Benito Mussolini was a major figure during this war.

  • WWI
  • WWII

This war resulted in the Cold War.

  • WWI
  • WWII

The first tanks were used during which war?

  • WWI
  • WWII

This war was triggered by the assassination of an Archduke.

  • WWI
  • WWII

Nuclear weapons played a major role in this conflict.

  • WWI
  • WWII

It was also called "The War to End All Wars."

  • WWI
  • WWII

It was also known as "The Great War."

  • World War I
  • World War II

Of the two wars, which one lasted the longest?

  • WWI
  • WWII

Which war killed more people?

  • WWI
  • WWII

Harry Truman was U.S. President for part of this war.

  • WWI
  • WWII

This war was a war mostly driven by conflicting ideologies.

  • WWI
  • WWII

David Lloyd George was Prime Minister of Britain during which war?

  • WWI
  • WWII

The League of Nations (forerunner to the United Nations) was created following this war.

  • WWI
  • WWII

A terrifying weapon called the flamethrower was first used during this war.

  • WWI
  • WWII

During which war was Turkey considered one of the "Central Powers"?

  • WWI
  • WWII

In which war did military deaths outnumber civilian deaths?

  • WWI
  • WWII

The Battle of the Bulge was a major event during which war?

  • WWI
  • WWII

The Lend-Lease act was passed during which war?

  • WWI
  • WWII

During this war, Russia attacked Germany.

  • WWI
  • WWII

During this war, there was a terrible siege at Leningrad.

  • WWI
  • WWII

The Versailles Treaty was signed at the end of this war.

  • WWI
  • WWII

It was also called The Great Patriotic War.

  • WWI
  • WWII

Near the beginning of this war, the Italians broke a fragile peace.

  • WWI
  • WWII

At the beginning of this war, the Soviet Union invaded parts of eastern Poland.

  • WWI
  • WWII

Aircraft were first deployed in significant numbers during this war.

  • WWI
  • WWII

The Marshall Plan, a reconstruction plan, was enacted after which war?

  • WWI
  • WWII

Operation Barbarossa was a key element of this war.

  • WWI
  • WWII