McGraw Hill
Glencoe: The United States Economy
This site gives a concise outlook of the United States Economy in the early twenty-first century. The summary is brief, but it is easy to read and understand. Includes numerous links to graphs.
Federal Reserve Bank
Federal Reserve Bank of St. Louis: Fred Economic Data
With files in many categories, FRED offers a wealth of historical US data on interest rates, business indicators, balance of payments, exchange rates, and lots more.
US Department of Commerce
Bureau of Economic Analysis: Gross Domestic Product
This site contains links to gross domestic product data prepared by the Bureau of Economic Analysis.