Google Scholar provides a simple way to search for scholarly literature broadly. Search across a wide variety of disciplines and sources: articles, theses, books, abstracts, and court opinions.
The U.S. Census Bureau
The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy.
Internet Archive is a non-profit digital library that provides public access to collections of digitized materials, including websites, software, games, music, videos, images, and millions of books.
Pew Research Center
The Pew Research Center is a nonpartisan American think tank that provides information on social issues, public opinion, and demographic trends shaping the United States and the world.