What historic event happened in 1972?
richard nixon became the first american president to visit china, opening up trade between the two nations.
president richard nixon signed a treaty with taiwan, promising never again to trade with china.
mao zedong died while president richard nixon was visiting china.
president richard nixon represented the government of taiwan in asking to be a part of china again.

gradpoint answer

A. Nixon was first AMerican President to visit china and open up trade between the two

Explanation: This happened after 25 years of no diplomatic exchange or communication

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explanation:

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.