Stop me if you've heard something like this before:
"The secret to the strength of the US economy and global hegemony is that oil is denominated in dollars, rather than Euros or yuan or gold or Bitcoin; this is why the US-Saudi alliance is so critical."
Or simply,
"The US invaded Iraq to take their oil, and that's why they're opposed to Iran."
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This is all so economically and historically illiterate it's honestly "not even wrong." But it begs a serious question: what is it about oil specifically that makes people--including otherwise reasonable and informed people--start talking conspiratorially in deranged terms, akin to survivalists stuffing gold under their mattresses in their bunkers?
Do people (other than obvious nutters) talk this way about rubber, lithium batteries, food, fresh water, etc.? Because I haven't seen it.
You are correct that people don't talk in the same way about all those things, mostly I think because oil is the most valuable and has the most sensational history ('There Will Be Blood'...) but, in fact, most commodities and not just oil are traded on the world market with the U.S dollar.
I agree that the war for oil stuff is conspiratorial nonsense specifically but...
1.Parochial Boy is absolutely correct but doesn't go far enough. Obviously it's impossible to know for sure, but it's reasonable to speculate that without the boost that the U.S dollar receives from being both the 'Petrodollar' and the world reserve currency, given the enormous U.S government budget deficit and debt, that the U.S dollar value would collapse relative to other currencies and the IMF would have to come in and impose austerity on the U.S financial system.
2.While it's hard to find much evidence that the U.S engages in 'war for oil' stepping back a bit I don't think anybody can dispute that the U.S keeps a military presense all over the world in order to protect its interests, including protecting nations where the U.S has oil interests (both for the private U.S oil companies who have concerns in these nations and to protect U.S oil flows.)
3.On the history, while this does go back a long way now, it's also beyond dispute that the U.S government overthrew the (semi) democratic government in Iran and brought back the Shah at the request of U.S (and British) oil companies.
So, with respect, it's you who is wrong on the history and economics of oil.