 In 1880, the Hayes Administration appointed U.S. diplomat James B. Angell to negotiate a new treaty with China.The resulting Angell Treaty permitted the United States to restrict, but not completely prohibit, Chinese immigration.In 1882, Congress passed the Chinese Exclusion Act, which, per the terms of the Angell Treaty, suspended the immigration of Chinese laborers (skilled or unskilled) for a period of 10 years.