Winner
Diverse in Unity
Integrate countries that were ennemies and fought bitter wars, so war become impossible in Europe, conflict are solved peacefully, wealth creates wealth, pool resources so we work together and don't waste time or money on useless redundant tasks and program.
So everyone is happier at the end.
Then, expend the system to other countries, with an adament requirement that they reform to match our values (democracy, human right, free trade) before they can integrate, until the whole world is one big human nation.
Umm, that's not up to us.
Europe, above everything else, should estabilish itself as a unified continent, able to make its own decisions and follow its interests without others, be it Americans, Russians, Chinese or Arabs, meddling into its affairs.
Integration of the rest of the world is up to them, not us. We can help, but that's it.