http://en.wikipedia.org/wiki/Columbian_Exchange
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Marshall Plan
The land of Europe and Asia together is sometimes called
WW1 was called a world war, because in effected and involved most, if not all of the countries in Europe, Australia, some of Africa, and America. The major powers in the war can be defined as the axis (Germany, Italy, and Spain) and the Allies (France, England, and later America).
North America and Europe, Australia also Asia, that is why it was called a "World War". There was also some fighting in Africa.
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