The United States and 11 other Pacific Rim countries have agreed to an ambitious and controversial trade pact that cuts trade barriers, sets labour and environmental standards and protects multinational corporations' intellectual property.
The agreement on the Trans-Pacific Partnership (TPP) was reached on Monday after marathon negotiating sessions in Atlanta through the weekend.
The US Congress will have 90 days to review the agreement and will have to give it an up-or-down vote, no amendments allowed.
Japanese prime minister Shinzo Abe welcomed the basic agreement as "a far-sighted policy for all participating countries that share the values and try to build a free and fair economic zone".
The TPP is designed to encourage trade between the US, Australia, Brunei, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore and Vietnam.