Virtually all of the specific economic policies advocated by the Italian and German fascists of the 1930s have also been adopted in the United States in some form, and continue to be adopted to this day.
Political decentralization in modern times has shown itself to be the most potent intellectual restraint on the growth of Leviathan. The Constitution is not enough.
Michael Huemer has written outstanding book exposing many of the ways that many people fail to misunderstand logical fallacies in many ideological debates today.