Imperial presidency
Arthur M. Schlesinger Jr. popularized the term "imperial presidency" during the Nixon administration in his 1973 book "Imperial presidency". The term implies the self-imposed rule by one leader or emperor within a constitutionally established government. Most would consider the U.S.A. government to be democratically controlled, but it is the constitution’s 3 branches (Executive, Judicial, and Legislative) that create and impose the of constitutionally upheld rule law. Though the U.S.A. is considered a democracy because it's constitution is a living document, malleable and changeable according to the interest of a democratically elected congress.