Keynes was able to make his proposal the official British proposal at the Bretton Woods Conference but it was not accepted. Rather than a supranational currency, the conference adopted a system of pegged exchange rates ultimately tied to physical gold in a system managed by the World Bank and IMF. In practice, the system implicitly established the United States dollar as a reserve currency convertible to gold at a fixed price on demand by other governments. The dollar was implicitly established as the reserve by the large trade surplus and gold reserves held by the US at the time of the conference.