Mongol armies rode out of central Asia to invade and conquer first one part then another part of the muslim world
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very strong central government; little regional or state control= unitary
power shared between central government and regional or state= federal
weak central government; strong state or regional government = confederate
Maintaining economic isolation. In this quotation, Emperor Lung saw no reason to allow Europeans to import their products into a self-sufficient China which was experiencing a favorable balance of trade at the time with European nations which demanded Chinese tea, porcelain, and silk.
