I used to think that to but honestly, it IS in writing, its in the treaties and agreements. For example there is a commitment to a North American "perimeter" to be eventually expanded to S America. Now remember conspiracies don't exist because people get together and and wring their hands and ask " how can me and Minnie me take over the "world" they exist because of common goals mostly economic ones that lead to compromise. That compromise will Not be in any way shape or form the limited Government we here at FR keep fighting for. It will not be Lockean, or Burkean or based on natural rights in its foundation, it will resemble the much more popular nanny state socialist tyranny that for the promise of a lousy HMO, free condoms and a right to keep your mouth shut people are crawling all over themselves to vote for worldwide.
If you have ever played the board game "Risk", you will realize it is a heck of a lot easier to defend North America than the US by itself. No way in except through Panama or by boat!