 After negotiations through Chinese mediation (1881–1882), the Treaty of Peace, Amity, Commerce, and Navigation was formally signed between the United States and Korea in Incheon on May 22, 1882.The 14-article document provided for the protection of shipwrecked sailors, coal supplies for American vessels entering Korea, trading rights in selected Korean ports, the exchange of diplomatic representatives, granted the Americans extraterritoriality rights and most-favored-nation status in Korea.In return, the United States agreed not to import opium or arms into the country, Korean tariffs were kept high, extraterritoriality was made provisional upon the reform of Korean laws and judicial procedures to conform to America's, and there was no mention of permitting missionary activity.