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Power struggles between the nations of Europe led to World WarⅠ(1914-18).
The Russian Revolution in 1917 led to the creation of the Soviet Union.
World War Ⅱ(1939-45) was led by Germany and other countries.
After the war, the Soviet Union spread communism across Eastern Europe.
The Soviet Union broke up in 1991.
In 1957 six European nations formed the European Economic Community (EEC).
In 1993 it was renewed to the European Union (EU).
In 2002, 12 EU states adopted a new currency, the euro.