No President can control the world. Woodrow Wilson could direct assets to help win the Great War against the Germans but couldn't get a League of Nations through the Senate. Franklin Roosevelt could control both the European and Pacific wars but left behind the Soviet Union and a half-century of nuclear tension.
No one else has even come close.
The two candidates have been studying hard for tonight's debate. Moderator Bob Schieffer is not likely to quiz them on the names of heads of state, but he may well try to get them to discuss that very issue:
With the rise of the EU, the re-emergence of Russia, the enormous financial power of China, and the inter-dependency of just about every country on the planet; what are you planning to do to try and get them, if not to play nicely with one another, to at least stop threatening each other with every arrow in their national quivers including money, natural resources, and weapons?
I'd be interested in hearing the answer to that question.