The transition from petrodollars to energy dollars, a prophet who enjoys thinking and sharing personal essays. Why are countries buying U.S. Treasury bonds? Previously, the United States stored the gold of various countries in its vaults, tying U.S. Treasury bonds to gold. Take a good look at the relationship between the beginning of U.S. Treasury bond issuance and the time when gold was stored in the U.S. After understanding this, it feels enlightening.