^ I agree, but without England i guess
Seriously, be it a hard contact with some asteroid or a debatable what was called a "contact of the third kind", mankind will sooner or later have to come to terms with itself, with one mankind and an existence without artificial nations. There is of course the other "branch", the possibility of fading awy and dying out.
Before WW1 there were not even borders in the sense mankind has it today, clearly not an achievement.