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Selected primary sources
Human Rights Studies Online
Comparative documentation, analysis, and interpretation of major human rights violations and atrocity crimes worldwide from 1900 to 2010.
Public opinion data from academic, commercial and media survey organizations.
Correlates of State Policy
Hundreds of variables, across the U.S. 50 states and time (1900 – 2016), that represent policy outputs or political, social, or economic factors that may influence policy differences across the states.
Comparative performance measurement data for the 50 states.
General Social Survey
Sociological and attitudinal trend data covering the U.S.
American National Election Studies
Survey data voting, public opinion, and political participation.
MIT Election Data
Free datasets on federal, state, and local elections.
Dave Leip's Atlas of U.S. Elections
Federal election results, some free, some for-fee.
Global current and historical data for measuring democracy, including types of democracies, elections, gender equality, and more.
World Military Expenditures and Arms Transfers (WMEAT)
Expenditures, arms transfers, armed forces, and related economic data worldwide.
Quality of Government Institute
Research and data on the causes, consequences and nature of good governance and the quality of government.
Integrated Network for Societal Conflict Research
Datasets on armed conflict, state fragility, and more.
Global Terrorism Database
Information on terrorist incidents 1970-2016.
Correlates of War Datasets
Quantitative data in international relations.