How Did The USA React To Soviet Expansion?

President Truman of the USA is trying to resist the spread of communism with the 'Truman Doctrine'. The Truman Doctrine states that the US will help any country that is being threatened by a Communist take-over. They will send money, equipment, and advice to any country! They are making it clear that our expansion will be given a limit and if we break that limit, military force will be applied. Also, they plan to give aid to the countries in Europe with money, to help the economy. This might weaken our hold on Europe, it sounds suspicious. I think we should definitely try to put a stop to this!