The United States has sent diplomatic representatives to China since 1844, when Caleb Cushing, as commissioner, negotiated the Treaty of Wanghia. Commissioners represented the United States in China from 1844 to 1857.
Since 1844, the United States has sent diplomatic officials to China, with Caleb Cushing acting as a representative and negotiating the Treaty of Wanghia. These envoys served until 1857.