Which cold war event happened last?
a. the korean war ends.
b. sputnik is launched.
c. the vietnam war ends.
d. the cuban missile crisis takes place.

The cold war event that happened last was: C. The Vietnam war ends

Cold war event refers to the event that occurs due to the competition between untied states with democratic ideology with the soviet union with communism ideology.

Vietnam war ended in 1975, later than other options above. The war occurs between north Vietnam backed by soviet union versus southern Vietnam backed by united states.

a memoir is the correct answer