system
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human
[Fallout] Why was there a dire need for oil?

Hey fellow wastelanders,
I read on a old library terminal that there was a huge war going on before the Atomic destruction. Mostly in Europe and the middle east. It stated that the main reason to fight was to gain control over the little oil reservoirs left in the world. But why did the fight over fossil fuels? I mean didnt they have fusion technology in almost everything? Or were there any other reasons?
gpt
I always assumed the reason it was so highly fought over is that the US was tight-lipped as fuck on their fusion tech. Therefor, the US enjoyed a relatively stable (Until the last decade or so before the war) fusion driven economy while the rest of the world suffered. Likely part of the reason China was desperate enough to invade.