One-World
One World is the idea of a one World government, economy, and law. social standards and justice will be guaranteed by the world government. As it is today, also subdivision of authority is necessary, which means that there are still governments of countries, states and cities. The idea is to govern the frame in which the sub-governments can act and also allow to equalize political, environmental, and economic differences. The One-World has, beside the common government, a common constitution, court and police (army is not needed any more).
The big question about a common structure for all countries is how the economic differences can be balanced without destroying the cultural roots and self-contained life in each region, which is the balance between government and autonomy. The answer to this question needs to be given in all organized structures which humans give themselves to bring the most benefit to all. Open economic borders without common rights for all lead to exploitation of the weak.
In economic categories some regions need to pay and some needs to be helped. Therefore will it happen that regions, which are countries today, will loose economic power but win stability and markets in the mid-frame time range. If the economic calculation will also take the future into account, an One-World organization will also be a win in economic categories.