The long-term effects of the Mongol Empire on China, Russia, and Iran share similarities in terms of political and social changes. All three regions experienced a period of centralized rule under Mongol domination, which resulted in significant cultural and economic exchanges. However, the extent of these effects varied with China facing a greater assimilation of Mongol culture, Russia benefiting from increased trade and political stability, and Iran undergoing a decline in its political power and cultural assimilation.