The Dillon Round was a multi-year multilateral trade negotiation (MTN) between 26 nation-states that were parties to the GATT.
Along with reducing over $4.9 billion in tariffs with about 4,400 item-by-item cuts, it also yielded discussion relating to the creation of the European Economic Community (EEC).
Significant concessions on tariffs to agricultural exports were granted by the United States.
At the time, the six-nation EEC accounted for one-sixth of US foreign trade, including over one-fifth of US farm exports.
The Trade Expansion Act was passed as a result of the Dillon Round, in order to "help preserve the economic basis for Atlantic co-operation.