What chinese practice demonstrated the belief that china was superior to other nations?

The Chinese government secluded their country from other nations to show its self-sufficiency. It is a condition of not requiring any help or support for survival or it does not trade with other nations. Foreign representatives or diplomats who go to the country were compulsory to bow to the Chinese emperor making him superior.

For apex the answer is:
“Foreign diplomats were required to bow to the Chinese emperor.”

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