3)+Why+does+JFK+use+the+word+pledge+instead+of+request

He chooses pledge instead because he wants to appeal to these people with emotion. He is pledging to make sure he will help these people not because they could be used for exploitation, but because it is the right thing to do as a powerful nation

How does understanding his diction in the capitalized passage make this passage far more effective than it should be?

[The House]