What would happen if the U.S. dollar fails?

A US dollar collapse would trigger unprecedented global economic chaos. Consequences would include: immediate worldwide stock market crashes, massive inflation in the US and globally, collapse of international trade (since ~60% is dollar-denominated), sovereign debt crises (many countries hold dollar reserves), commodity price explosions (oil, gold priced in dollars), potential depression in the US, banking system failures, and geopolitical instability. Alternative reserve currencies (Euro, Yuan, gold) would struggle to replace the dollar's role. However, complete dollar failure is extremely unlikely due to the US economy's size, military strength, institutional credibility, and lack of viable alternatives. More realistic scenarios involve gradual decline in dollar dominance rather than sudden collapse.