If the last 700 years are any indication, reserve currencies have a shelf life of roughly 100 years. The U.S. dollar (USD) officially became the world reserve currency 77 years ago (Bretton Woods, 1944). Arguably, USD was the reserve as far back as the late 1920s.From a historical timeline perspective, the USD is in the twilight of its reserve status. Couple that with the fact that the United States is also expanding the money supply exponentially (devaluing the purchasing power of the existi...