600 - 1450 Regional and interregional interactions (K-A)
European Middle Ages: feudalism and serfdom (K-A)
Sunni and Shia Islam (K-A)
Golden Age of Islam (K-A)
Maya, Aztec, and Inca (K-A)
Environment and trade (K-A)
Development of new trading cities (K-A)
Cultural interactions along trade routes (K-A)
Development of financial institutions (K-A)
Disease and demography (K-A)
Social institutions in the Islamic world (K-A)