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A world war is a military conflict that affects the majority of the world's
countries. World wars usually span multiple continents, and are very bloody
There have been two main world wars, World War I and World War II. Both wars
occurred in the 20th Century, and involved some degree of participation from
most of the world's existing countries.
Since the conclusion of World War II, the world has generally been united by
a common desire to never again have another world war.
* World War I (1914-1918)
* World War II (1939-1945)
* World War III (hypothetical(The Cold War)(1949-1993))
* World War IV (the war on terrorism)