Top Choices:

• CultureGrams
  Country reports that provide snapshots of the world’s cultures
• U.S. History In Context
  Complete overview of the most-studied events, issues and current information in U.S. history
• World History In Context
  Provides coverage of events, themes and trends in world history from antiquity to the present

More Options:

• ArchiveGrid
  Index to descriptions of archival collections held by libraries, museums, historical societies and archives worldwide
• Britannica Online
  Encyclopedia articles, magazines and journals, Web sites, multimedia, dictionary and thesaurus entries
• Opposing Viewpoints In Context
  Thousands of pro and con viewpoint articles and topic overviews

eBooks:

• Encyclopedia of Espionage, Intelligence, and Security
  
• Fashion, Costume, and Culture: Clothing, Headwear, Body Decorations, and Footwear
  
• Gale Encyclopedia of Multicultural America
  
• Gale Encyclopedia of U.S. Economic History
  
• Renaissance: An Encyclopedia for Students
  
• St. James Encyclopedia of Popular Culture