What was the long-term strategy of the United States during the Cold War?

Basically it was containment via the Truman doctrine and
marshall plan.

Only the method in which those policies were
implented changed ro rather became aggressive after the Korean war and the cuban missile
crisis. Both incidences marked the militarization of the cold war and alerted both the
superpowers the danger of the nuclear weapon than any other period of the cold war
history.

During the early stage of the cold war, the us
employed containment policy in western europe so as to curb communism influecen. It was
more of an economic and political approach rather than military. Also the containment in
Asia was marked by large sum of aid. But with the start of the cold war, and the cuban
missile crisis, the militarization of the two superpower became
prominent.

These means were not only curb communism but
also build informal US empire in which the ideology and economic system that US deem
right is most prevalent. Until the cuban missile crisis, us believe such us hegemony was
possible, but after 14days of crisis, us had to admit that they can not totally
eradicate the soviet union but to find ways to co-exist
peacefully.