Petrodollar warfare hypothesis

"Most oil sales throughout the world are denominated in US Dollars, and according to proponents of the petrodollar warfare hypothesis, 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 US Dollars and upwards pressure on its value, regardless of economic conditions in the United States. This in turn allows the US government to gain revenues through seignorage and by issuing bonds at lower interest rates than they otherwise would be able to. As a result the US government can run higher budget deficits at a more sustainable level than can most other countries."
--http://newamerica-now.blogspot.com/2012/01/russian-move-against-us-called-first.html