Solution

“We can identify three constraints on American Power” which were actually not in operation in the years following 9/11. Hence the US could establish its hegemony. Recently all these constraints are slowly beginning to operate in the following ways:
1. The US bears institutional architecture in the American State itself. It refers division of powers between the three branches of government where American military’s executive branch can place significant brakes upon the unrestrained and immoderate exercise.
2. The second constraint on American hegemony emerges from open nature of American society. American society and suffering from a deep skepticism towards purposes and methods of government in America despite an imposition of particular perspectives on domestic opinion in the US. This is a huge constraint on US military action overseas.
3. The third constraint on US hegemony is the possession of NATO to moderate the exercise of the US hegemony today. The US has an enormous interest in keeping the alliance of democracies to follow the market economies alive and it may be possible to its allies in NATO to moderate the exercise of the US hegemony through their own liberal policies to fulfill their own ends.