The Treaty of Versailles caused long-term instability in Europe (and parts of Asia) by ignoring the nations who had lost WWI. The treaty didn't provide any support for the nations who had lost, creating resentment in the hearts' of their people. This disunity allowed for the rise of facist dictators post-WWI, eventually causing World War II.
World War II was a conflict between 1939 and 1945 that involved all the world's major countries. It was the most destructive war in history and millions of people were killed. It was fought between the Axis (Germany, Japan, and Italy) and the Allies (Britain, the US, and the Soviet Union among others).
What treaty are we talking about?
Many people trusted their money to banks that could not afford to refund them. They lost a lot of money.
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