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

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.