The US dollar's role as world reserve currency gives America 'exorbitant privilege'—the ability to print money and export debt the rest of the world absorbs—and American aggression is driving BRICS nations and Iran into an alliance whose realization (Russia-Iran-China, eventually India) would create a Eurasian continental trade system that excludes America, causing American economic collapse, which is why America pursues regime change in Iran as a life-and-death struggle.