By war? Fair enough, it makes sense somehow because the we can presume that the winner of it (USA in this case) will take over the losing country. Thus, will have the control on all of its manpower, assets etc. and they can also introduce their currency for them to use it. However, engaging in war does not give you a flawless victory. There's no such thing as that because nobody knows exactly the capabilities of the opposing country. Of course they will spend lots of money on their arsenal so the question is, Is that even worth it? Nah, I don't think so. Simply because it's negative side is always greater than the good one. Just like what Neville Chamberlain said, "In war, whichever call itself the victor, there are no winners, but all are losers".
Every country got their own agendas. Some are willing to help, some are dormant and some are opportunistic. Now you may realized that our world is not based in your or even our ideals. It is what it is and I'm not happy about it .