Man, you are making some bold assumptions, Skynet. I am not financially well off for starters. As being the most prosperous nation of the world, if that is the case then we should take care of our own people first so that every child has adequate healthcare. That we don't have mothers who have to choose between which child gets medical care and which child dies. That we don't have people still homeless and living in squalor in our own nation. When we have healthcare for all within our nation, when we have zero homeless and unemployment, then I will consider ourselves prosperous enough to help other nations.
The US government first and foremost responsibility is to the care and well being of its own people, not the Iraqis, Chinese, Japanese, Russians, Mexicans, and so forth and so on.