because a world war is when the whole world is at war against one united force. World War 2 was the Russia, America, and many others against nazi, Germany and the Japanese.
Isn't not having a world war a good thing?
I suspect another reason is because of M.A.D., (mutual assured destruction), where the attacker and defender would both be wiped out by each others' nuclear weapons. Basically no-one has been crazy enough to press the button first during conflicts (yet).
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There is no World War 3.
There hasn't been a war called the 'Third World War'.
Possibly but if there was a third world war it is highly unlikely that the second world war would be the cause.
To establish the third Reich around the world
The cold war from the point of view of the people and country's that were being literally destroyed was certainly not the Third world war. However from the point of view of those that make cold hard cash and gain power it was actually better then the second world war.