The U.S. Federal government collects and compiles information and statistical data from sources across the country, and makes much of that information public through some of the resources listed below. This is not a comprehensive list of federal government sources, but it's a good place to start. Don't hesitate to reach out to your subject specialist librarian for further assistance.
The US Census Bureau is the most robust source of data on the demographics and economic activity of the American people. Below are links to demographic profiles exploring the data of different racial and ethnic minority groups in the United States.
The US Government is divided into three co-equal branches: the Executive, Legislative, and Judicial Branches. Information about each branch can found below. Consult the US Government Manual for more information.