President Richard Nixon’s foreign policy of détente was an attempt to

Nixon

Explanation:

President Nixon pursued two important policies that both culminated in 1972. In February he visited Beijing, setting in motion normalization of relations with the People's Republic of China. In May, he traveled to the Soviet Union and signed agreements that contained the results of the first Strategic Arms Limitation Treaty talks (SALT I), and new negotiations were begun to extend further arms control and disarmament measures.

Improve relationships between US and Soviet Union

Explanation:

well considering i can't see the graph, it's probably prices