There is 8 billion people in the world, with the number increasing still. You will always have to choose whom you feel responsibility towards, because all 8 billion are beyond anyone's capability.
Same applies to entire countries; their capabilities and societal will are greater than an individual's, but still limited.
Declarations of very broad commitments towards the rest of humanity may sound noble, but wise(r) people should stay away from them.
And in this case to me the blank is "take on the world's tired huddled masses and set them up to be just as self-sufficient and successful as their native born." And I think that's pretty actionable, just about anyone could probably think of more than a few things that would push us closer to this.