Where can I find records relating to treaties with foreign nations?

Yes, records relating to the ratification of treaties with foreign countries are records received or created by the Senate Foreign Relations Committee and are available for research through the Center for Legislative Archives. Treaty records are arranged by Congress and thereunder alphabetically by name of country or chronologically.  alphabetically by name of country for each Congress. This series comprises of communications from the President that transmit treaties, except Indian treaties; copies of the text of the treaty being transmitted; and committee executive reports. Some files, particularly those of the 20th century, also include correspondence, exhibits, drafts and/or copies of conditions and stipulations, staff memorandums, and hearing transcripts.

The Senate Executive Journal, available for use at the Center (and online from the Library of Congress for the period 1789-1875 and from HathiTrust for most years) summarizes action taken on treaties and serves as an index to them.

Original and exchange copies of treaties are part of the General Records of the U.S. Government (Record Group 11), and can be accessed by contacting the Archives 1 Reference Staff at archives1reference@nara.gov, 700 Pennsylvania Ave, NW, RDT1R, Washington, DC 20408.

Texts of treaties and international agreements are published by the Department of State and are available online and in libraries nationwide.