Census Data, Historical
- Historical Statistics of the U.S.Detailed statistics of trade, economy, population, etc. for the United States from Colonial Times (mostly agricultural output at that time) to 1970.
- Census volumes, 1790-2000Contains full text PDF of all of the volumes of the decennial census on population and housing for each state and county from 1790 to 2000.
- Historic GIS, NHGISThe National Historical Geographic Information System (NHGIS) provides, free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2000.
- Historical Census data and other data maps, Social ExplorerThis commercial website allows free visualization to state-level data in general categories from the 1970, 1980, 1990, and 2000 census. To see more fine levels of geography or to see the 2010 census data, you have to pay for premium access.
- Integrated Public Use Microdata Series, 1850-2000The IPUMS consists of twenty-five high-precision samples of the American population drawn from thirteen federal censuses. This site has taken samples produced elsewhere, and has harmonized them so that users can query across samples.
Foreign Relations
- Foreign Relations of the United States (UW)This digital edition of the Foreign Relations of the United States from 1861 to 1960, with most volumes between 1900 and 1945. The digital version is not complete; there are volumes missing. This series contains the text of communications of the U.S. Department of State. It is both searchable and browsable.
- Foreign Relations of the United States (State Dept)Official site with recent FRUS volumes from the U.S. Department of State. Earliest volume is 1945, latest is 1980. Most are from the Kennedy and Johnson administrations.
