This site is arranged to provide links to all 50 states, many counties and some city governments. Also selective categories for multi-state sites, federal resources, national organizations, and other links.
The National Archives preserves documents relevant to U.S. history/government and oversees the management of all federal records. This site is well-organized, visually appealing and updated on a regular basis and has something for everyone.
Maintained by Cornell Law School, this site provides a wealth of reliable and accurate information on the U.S. Supreme Court. Contains all official Supreme Court decisions and summaries decided since May 1990.