Imperial presidency is a term applied to the modern presidency of the United States. It became popular in the 1960s and served as the title of a 1973 book by historian Arthur M. Schlesinger, Jr., who wrote The Imperial Presidency to address two concerns: that the presidency was uncontrollable and that it had exceeded its constitutional limits.[1] According to professor of political science Thomas E. Cronin, author of The State of the Presidency, "imperial presidency" is a term used to define a danger to the American constitutional system by allowing presidents to create and abuse presidential prerogatives during national emergencies.[2] This was based on: (1) presidential war powers vaguely defined in the Constitution, and (2) secrecy – a system used that shielded the Presidency from the usual checks and balances afforded by the legislative and judicial branches.[2]