Here's a deal, we give every foreign country a certain amount of money to buy our exports with.
Ok lets try this out. Your are the United States. You have ten bucks in your pocket and a brand new hammer. I am a third world country with no money, no hammer and no nothing. You give me ten bucks in foreign aid. I use the ten bucks to buy the hammer. I'm happy because I have a hammer which I did not have before. You on the other hand, started out with ten bucks and a hammer, but now you only have ten bucks. How smart is that?