To my understanding the reason Truman helped the Europeans and Asian countries was because of communism, when countries are weak and poor they fall to communism and he didn't want that.
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Following WWII, most European countries were completely destroyed, economically, industrially and agriculturally. In fear of many European nations falling prey to communism, the United States set up the Truman Doctrine on 12 March, 1947, which allocated $400 million to Greece and Turkey in military and economic aid. Due to the success of the Doctrine, the Marshall Plan was created in June of 1948. The Marshall Plan was direct economic aid for any democratic European nation who needed it. At its end in 1951, the Marshall Plan cost the United States over $13 billion.
it was written so that the U.S could help out (prevent) countries who were thinking about becoming Communists
Provide for economic recovery in Western Europe
That plan enabled European countries to be able to rebuild themselves and to be able to re-establish new governments and economies based on the democratic principles and peace with one another.
The policy of the United States to provide aid to countries attempting to prevent a communist takeover was called the Truman Doctrine. Harry S. Truman was America's 33rd President.