Oil currently supports the US dollar. This is where the term "petro-dollar" comes from.
After the gold standard was abandoned in 1970 by Nixon, the US needed something else to "back up" the US dollar. It tried grabbing up public US land and selling it to other countries (see: creation of EPA and its various "nature" programs which have 25% of US land locked up).
After that ran out (only so much land to sell off), the global banking cabal turned to oil. The 2 decades war in the middle-east is all about securing oil resources for saudi arabia and co. In exchange, they agree to exclusively sell Oil in USD. Thus propping up the petro-dollar.
For more history around this, see
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