Answered

The Cold War was a period of history during which

the Allied powers defeated Hitler.

the United States and the Soviet Union fought each other.

the United States and the Soviet Union mistrusted each other.

atomic bombs were dropped for the first time.

Verified Answer :

The Cold War was a period of history during which "the United States and the Soviet Union mistrusted each other" since the conflict existed between these two super powers, but no shots were ever fired between them (only in proxy wars). 

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Answer:

"the United States and the Soviet Union mistrusted each other."

Explanation:

The Cold War was a political, economic, social, military, informative and scientific confrontation initiated after the end of the Second World War between the Western (Western-Capitalist) bloc led by the United States, and the Eastern bloc (Eastern-Communist) led by the sovietic Union.

Its origin is usually between 1945 and 1947, during the tensions of the postwar period, and lasted until the dissolution of the Soviet Union (beginning of perestroika in 1985, nuclear accident of Chernobyl in 1986, fall of the Berlin wall in 1989 and failed coup in the USSR in 1991). Neither of the two blocks ever took direct actions against the other, which is why the conflict was called "cold war."

The reasons for this confrontation were essentially ideological and political. On the one hand, the Soviet Union financed and supported revolutions, guerrillas and socialist governments, while the United States gave open support and propagated destabilizations and coups, especially in Latin America and Africa. In both cases, human rights were seriously violated.