Truman Doctrine: Responsibility Quotes

How we cite our quotes: (Sentence)

Quote #4

The free peoples of the world look to us for support in maintaining their freedoms. (106)

Wait—what? How? Why? When did this become our job?

Quote #5

I am confident that the Congress will face these responsibilities squarely. (109)

This is the very end of the speech. Why is Truman so confident that Congress will respond? What has he said, how has he said it, and what has he done to make sure Congress will react to these "responsibilities" so positively?