It is important to limit a government's power because, unchecked, a government can impose laws
Farmboys, shopkeepers, artisans, urban workers
One of the effect of the interaction between China and Korea is Cultural Diffusion.
Currently, korean culture is a mixture of Japanese and Chinese cultures from their previous contact hundred years ago. You can see the similarties of culture and tradition between these three countries, whether from their traditional clothes, music instrument, writings, etc
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