What does the U.S. government hope to achieve through the use of its antitrust policy? How does international competition affect domestic antirust policy?

Good question. I will be happy to critique your thinking. The goal of Antitrust policies is to maintain viable competition, so that the consumer is served. Now for the second question, remember that not all cultures agree that is a good thing. You can be certain in USSR, IRAN, Saudi Arabia, and Venezula there is only one oil company exporting oil.