World Federalism
World federalism or global federalism, is a political ideology that advocates for a democratic, federal world government. The world federation would hold authority on issues of global concern, while member states would retain authority over local and national issues. Overall sovereignty over the world population would largely reside with the federal government.
World federalism is distinguished from unitary world government models by the principle of subsidiarity, in which decisions are made as much as possible at the most immediate level possible, preserving national agency to a large extent. Proponents maintain that a world federation offers a more effective and accountable global governance structure than the existing United Nations organization, while simultaneously allowing wide autonomy for continental, national, regional and local governments.