The most commonly accepted answer to the "many earths" dilemma is that the universe as we perceive it is, in fact, a multiverse. Any given point common to every universe can and most likely has been divvied up between any number of reality perceptions. It is our experience that nations, states, and individuals moving through a point in space-time will or will not meet another nation, state, or individual moving and existing in that same space-time point more or less randomly. For whatever reason, Earth and the Sol System at large is a particularly intense intersection of a multitude of realities.
The exact mechanics of these reality "intersections" are unknown or, at best, guessed at and theorized about. Common governmental procedure seems to be to ignore the philosophical implications and merely exploit the situation to the best of that government's (or corporation's, or individual's) ability.
This dilemma is not of course unique to spacefaring civilizations, although our intersections commonly occur on a much larger scale. We frequently observe the dilemma playing out on the XX Century Earth most commonly found in all timelines, where two nations may find themselves occupying the same geographical space. An accommodation is either reached, or through some sort of metaphysical philosophical group think, both nations "ignore" the existence of the other.
I have to admire the stubborness of him and his supporters even though tis bill is basicly dead and done.
