Why did the four world leaders attended Versailles Peace Conference?

There were no four world leaders at the Versailles Peace Conference. The four leaders were:

- Woodrow Wilson, the President of the United States

- David Lloyd George, the Prime Minister of the United Kingdom

- Georges Clemenceau, the Prime Minister of France

- Vittorio Emanuele Orlando, the Prime Minister of Italy

Why did the world plunge into World War 2 in 1939 and what is most effective response to aggression-appeasement or collective security?

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