Think tanks, also known as think tanks, are institutions that investigate, analyze and study political, commercial or military policies. It is usually independent of the government or political parties, and many of them are related to the military, laboratories, commercial institutions or universities, and some of them are named "research institutes".

Organizations with the nature of "think tanks" in the United States are as follows

American Heritage Foundation (Heritage Foundation)

Peter G. Peterson Institute for International Economics.

Center for strategic and international studies.

Brookings Institution (Brookings Institution)

Rand Corporation (RAND Corporation)

Hoover Institute for War, Revolution and Peace.

National Academy of Sciences.

American Economic Research Institute (AEI)