Khan Academy
Khan Academy: Focus on Economics: Serfdom
The resource from Khan Academy provides practice questions for a high school world history course. This section assesses students' knowledge of the economic impacts of serfdom during the European Middle Ages.
Other
Benchmarks Online: Human Society
A wealth of information on topics such as, cultural effects on behavior, group behavior, social change, political and economic systems, social conflict,and global interdependence. Each topic is broken down in to benchmarks by age groups...