Why did the Ming dynasty isolate itself after pushing the Mongols out?

Which of these was not a key difference between northern and southern states at the constitutional convention? wanting to protect states’ interests vs. a government with strict rules having more, larger cities vs. having fewer, smaller cities wanting to protect agriculture vs. protect industries having many enslaved people vs. using less enslaved labor

The principle of checks and balances is based on the notion that

Where do buyers and sellers go to exchange a specific product