Until 1898, the Qing Empire did not have a system in place for the Emperor to accept the Letters of Credence of foreign representatives. From 1858 to 1935, the U.S. representative in China was formally Envoy Extraordinary and Minister Plenipotentiary to China. The American legation in Nanjing was upgraded to an embassy in 1935 and the Envoy was promoted to Ambassador Extraordinary and Plenipotentiary.