Think Tanks are defined as "institutions affiliated with universities, governments, advocacy groups, foundations, non-governmental organizations, and businesses that generate public policy research, analysis, and activity." (Harvard University)
Conservative Think Tanks
Liberal Think Tanks
Libertarian Think Tank
Non-Partisan Think Tanks
Click the image above to read a transcript of the Constitution by the National Archives
Click the image above to read a transcript of the Bill of Rights by the National Archives
Video by the Library of Congress