What is the effect of mentioning George C. Marshall and quoting his speech?

It shows that Marshall single-handedly convinced the United States Congress to

intervene in Europe after the war.

Explanation:

George Marshall was state secretary of the United States and plan a speech in June 5, 1947. He describe the problem of post war Europe and He convinces Americans and congress to reduce difficulty and encourage Europeans that Americans will not Dorminate them. He convince the congress to intervene in Europe after the ear.