We's outta heah! Here's my take on things...
The rest of the world looks on in wonder as on a certain pre-arranged day in 1922, the entire Aztec population boards the newly completed space ship "Azteca I" on a journey to a brave new world, full of peace and promise... and then in horror as American ICBMs detonate thoughtout the Aztec countryside the very next day! Fortunately the radiation shielding on the ship protects the people on board from harm. The ship lifts off, leaving the Aztec cities eerily vacant, its fields untended. Pandemonium ensues as the treacherous Americans, Egyptians, and Iroquois struggle to claim the abandoned territory and resources the Aztec nation left behind. The final global war begins and quickly escalates into a nuclear confrontation, in which the partially completed spaceships of the other nations are soon destroyed, preventing them from following the Aztecs into space.
Twenty years later, as the Aztec people are arriving at Alpha Centauri, the major cities of the world are in ruins, the human population of the planet has dropped by 75%, and those that remain struggle not only against their neighbors but also simply to grow enough food to survive. Technological progress has begun to reverse due to the scarcity of printed materiel and due to the worlds youth being raised to either be farmers or soldiers. To make matters worse, nuclear winter has begun to set in...
Abe, Hi, and Cleo: You want to control the world? You're welcome to it.

Cya later... or maybe not!
EDIT: Hmm, when entering this into the HOF, America didn't nuke me. Spy says he had no ICBMs left, though he did have some tac nukes. Anyway, the story still works!