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In page Petrodollar warfare:

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The United States dollar remains de facto world currency.[1] Accordingly, almost all oil sales throughout the world are denominated in United States dollars (USD).[2] Because most countries rely on oil imports, they are forced to maintain large stockpiles of dollars in order to continue imports. This creates a consistent demand for USDs and ostensibly supports the USD's value, regardless of economic conditions in the United States.