Responsive Web Design
Best of History Web Sites - curated history sites and activities
Bill of Rights Institute - primary sources focused on US history
MrDowling.com - (Grade 6-7) A teacher created site with grade-level history content
National Constitution Center - The U.S. Constitution learning website with an interactive constition
The History Learning Site - various parts of history explained simply (from a British perspective)
Smithonian's History Explorer - free resources for teaching and learning American history