Was the United States successful in early containment of communism?
Based on the early Cold War, Cold War Origins, Berlin & NATO, Korea War etc.

Yes, it was. In fact, the containment policy prevented communism from expanding from Eastern Europe to other nations in Western Europe, Southern Asia or the Americas.

Explanation:

Containment was the foreign policy strategy adopted by the United States after World War II, aimed at stopping the extension of the Soviet zone of influence beyond its limits reached in March 1947 and at countering the states likely to adopt communism.

Mostly, support to foreign states was through financial aid, notably with the Marshall Plan, but also military with the creation of the North Atlantic Treaty Organization (NATO). Containment was an important part of the Truman Doctrine, which aimed to actively intervene in support of foreign political regimes in order to fight communism.  

the committees of correspondence were the american colonies’ means for maintaining communication lines in the years before the revolutionary war. in 1764, boston formed the earliest committee of correspondence to encourage opposition to britain’s stiffening of customs enforcement and prohibition of american paper money. the following year, new york formed a similar committee to keep the other colonies notified of its actions in resisting the stamp act. in 1773, the virginia house of burgesses proposed that each colonial legislature appoint a committee for intercolonial correspondence. the exchanges that followed built solidarity during the turbulent times and bring about the formation of the first continental congress in 1774.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.