The name 'World War' should give you a clue. It happened over most of the world, and most of the world's leading countries were involved. Even the USA was involved for a while, but not as long as some other nations.
TEH WORLD
Yes, the Cold War was after World War 2
World War 2
World War 2
Apparently they didn't, because World War 2 DID happen.
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Dinosaurs
1939-1945
1939
World war 2 ended exactly 51 years ago
1939
World war 2 happend across Europe, Africa, Asia and in the pacific.