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Official portal to US government publications (replaces FD Sys & GPO Access). Freely accessible from about 1993 onwards, including Presidential documents, Congressional bills, documents, hearings & reports, the Congressional record, and Federal register. Also:
MetaLib from GPO - searches across official databases for reports, articles & citations, with links to full text.
Free site from UCLA that allows users to view every congressional roll call vote in American history on a map of the United States and on a liberal-conservative ideological map including information about the ideological positions of voting Senators and Representatives
For resources relating to US elections please see the Politics subject guide section for Elections. Voting
Official records of the foreign policy and diplomatic history of the US from 1945 to 1988 (publication is ongoing). Older volumes are also available for the period 1861-1960 from University of Wisconsin-Madison Libraries. See also:
Secretaries of Defense historical series of freely available publications online (1947-)
United States Treaty Series - digitised multilateral & bilateral treaties 1776-1949 on Library of Congress website (and its U.S. Treaties : a beginner's guide)