Answer:
Nikita Khrushchev impacted the relations with the U.S through the establishment of a policy of peaceful co-existence. This led to the signing of the Nuclear Test-Ban Treaty. He visited the U.S in 1959 with an intention to build the U.S-Soviet relationship. He was the first Soviet leader to visit the U.S.
Mikhail Gorbachev on the other impacted the relations with U.S through his modernisation of the Soviet Union which they all cooperated with and it finally led to the end of the cold war.
Step-by-step explanation:
Nikita Khrushchev was a Soviet politician and became the first secretary in the Communist Party. He led the Soviet Union during part of the Cold War.
Mikhail Gorbachev was formerly Soviet politician and last leader of the Soviet Union. Also, Gorbachev was the general secretary of the Communist Party of the Soviet Union.