A nonpartisan research and policy institute that advances federal and state policies to help build a nation where everyone — regardless of income, race, ethnicity, sexual orientation, gender identity, ZIP code, immigration status, or disability status — has the resources they need to thrive and share in the nation’s prosperity

The Comparative Agendas Project collects and organizes data from archived sources to track policy outcomes across countries.

The Congressional Research Service is a legislative branch agency, housed inside the Library of Congress, charged with providing the United States Congress non-partisan advice on issues that may come before Congress.

PolicyArchive is a comprehensive digital library of public policy research containing over 30,000 documents.

Definitive source on the study of congressional campaigns, elections, activities and political polarization & voting alignments.

"Apportionment" is the process of dividing the 435 memberships, or seats, in the House of Representatives among the 50 states (Constitution, Article 1, section II)