6th Grade - Ancient Civilizations
7th Grade - Washington State History
8th Grade - US History
ProQuest History Study Center
National Geographic for Kids
Good starting point for online geography work.Fun site with geography games, activities, etc.
Library of Congress
You can explore for a month through the American Memory Collection and the Online Exhibits, and still not see all the cool stuff located here.
PCL Map Collection
A collection of outline and base maps for continents, world regions, countries and states.
Smithsonian For Kids
History for Kids
Lewis and Clark Links
Lewis and Clark iSpace