"Lol! Yeah, they'll sit there and use their fuel to drive cars around, and eat their crops...meanwhile we use our military to take it all? C'mon, use your head."
Having the largest army or most powerful doesn't mean you can take out EVERY other country, unless you plan on nuking them... In that case, there's nothing left for you to take... Which leads me back to the "dying slowly" So yeah, there goes that.
"It's obvious I'm not going to be able to convince you that the US president is the most powerful person on the world, so I'd like to ask that you tell me who is."
No one and everyone.