I agree that federalism would be preferable in the case of the United States in theory, but experience has shown that in practice power tends to concentrate in

I agree that federalism would be preferable in the case of the United States in theory, but experience has shown that in practice power tends to concentrate in the highest level of sovereignty. I don't share your pessimism regarding wars and smaller sovereign states. I think a world filed with relatively small Switzerland-style nations would be a less bombed world.