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On July 3, 1844, Commissioner Caleb Cushing and his Chinese counterpart, Qiying, signed the Treaty of Wangxia, adding their official seals. In exchange for U.S. assistance in suppressing the opium trade, China opened five ports to U.S. merchants, granted legal rights and protections to American citizens, established tariffs, and awarded the U.S. most-favored-nation status.
General Records of the U.S. Government, National Archives and Records Administration