On August 15, 1971, Nixon announced the US would no longer exchange dollars for gold. The gold window closed. Every dollar became, overnight, a promise backed by confidence in the US government — nothing more. That moment reshaped global finance. Here is the mechanism.
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After WWII, the world ran on Bretton Woods: the dollar was convertible to gold at $35/oz. Every other currency pegged to the dollar. This made the dollar the global reserve — but also created a constraint. The US could only issue as many dollars as it had gold to back them. By the late 1960s, that constraint was binding.
Vietnam spending and Great Society deficits flooded Europe with dollars. Foreign central banks — especially France — started converting those dollars back to gold. By 1971, US gold reserves had fallen from 20,000 tonnes to under 9,000. The run was on. Nixon's choice: devalue, or close the window. He closed the window.
The immediate consequence: inflation. CPI peaked at 14.8% by the late 1970s. The petrodollar system — OPEC pricing oil in dollars — became the new anchor for dollar demand. But anchoring demand on oil is different from anchoring it on gold. One requires geopolitical enforcement. The other was math.
The 1971 shift is still live. Dollar reserve status now rests on three things: oil pricing convention, US military reach, and trade network effects. All three are being contested simultaneously. The gold window closed once. Every system built on 'trust us' eventually has to prove it.
