The quote below comes from a speech given by president harry truman in march 1947:

i believe that it must be the policy of the united states to support free peoples who are resisting attempted subjugation by armed minorities or by outside pressures. i believe that we must assist free peoples to work out their own destinies in their own way.

source:

which statement explains how this statement from president truman guided american foreign policy during the cold war?

it got the united states involved in conflicts around the world.
it led to a largely hands-off approach to nations facing economic problems.
it made military leaders more suspicious of the development of atomic weapons.
it significantly increased the amount of humanitarian aid the united states provided to europe.

It got the United States involved in conflicts around the world.

Explanation:

in the aftermath of WWII many countries were left unoccupied, or with new governments ready to star a new era on their history, this lead to a heavy sprout of communism around the world, in that time some of it was natural and normal, other rebels were being promoted by the soviets in order to grow their influence all over the globe, the Government saw communism as a threat to the soveraignity of the United States and because of that the Truman doctrine stated that America would do everything, from financial aid to send troops to countries where communism could be rising up and threat the country´s interests. This got the United States involved in conflicts all around the world, being Vietnam one of those.

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