How did the foreign-contact policies of three medieval Chinese dynasties affect China

Throughout the Ming Dynasty China had open and closed door policies which made them prosper and fall. ... These foreigners were called the Uighurs, and they were restricted because they were attacking the borders of China.

Explanation:

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social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv