1864 Immigration Act (An act to encourage immigration)
Sess. I, Chap. 246; 13 Stat. 385.
38th Congress; July 4, 1864.
You can find the full text of this law as a PDF here.
Established the position of Commissioner of Immigration, reporting to the Secratary of State; validated labor contracts made by immigrants before arrival; exempted immigrants from compulsory military service; established the office of Superintendent of Immigration for New York City.