Centers of power are localized regions of the world where political, economic and cultural influence are dominant for a time, hence defining a particular era in a particular sphere of influence. * Fertile Crescent **Mesopotamia * Ancient India **Indus Valley Civilization **Maurya Empire **Pala Empire **Chola Empire **Mughal Empire * Ancient China **Qin Dynasty **Han Dynasty **Tang Dynasty **Ming Dynasty **Qing Dynasty * Ancient Iran and Persian Empire **Achaemenid Empire **Parthian Empire **Sassanid Empire * Ancient Mediterranean **Ancient Egypt **Ancient Greece and Macedonian Empire **Carthage **Ancient Rome and Roman Republic **Roman Empire *Christendom **Byzantine Empire **Holy Roman Empire * Arab Empire **Rashidun Caliphate **Umayyad Caliphate and Caliphate of Córdoba **Abbasid Caliphate * Mongol Empire ** Yuan Dynasty * Portuguese Empire * Spanish Empire ** Habsburg Spain * Dutch Empire * French Empire ** French Colonial Empire * British Empire * Soviet Union * American empire, United States of America
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