Why Did Truman initiate his so-called Truman Doctrine in 1947?

The US developed the containment policy because of the belief that the Soviet Union was a neurotic and untrustworthy state that only sought to expand in communism, size and economy and US president Harry Truman, who needed to secure his own lot in political favor. The Soviet's "obsession with security" and desperate need for buffer states and a warm-water port were misunderstood as actions taken to convert more nations into communism. Clearly, the losses that …showed first 75 words of 398 total…

…showed last 75 words of 398 total…economics and militia, the US was kept constantly on its toes because of the constant threat of Stalin overtaking America's trading partners and possible 'war mongering'. Since compromise, as seen in the case of Hitler's Nazi Germany and the Allies, could not bring about change in the policies and ambitions of the aggressive states, the 'Iron Fist' was seen as the only possible way of dealing with Russia and containment the only solution to expansion.