What is American Exceptionalism?

Definition and meaning of American exceptionalism: American exceptionalism is the belief that the United States is unique among all other nations in the world, due to its political, economic, and cultural values. American exceptionalism often manifests in the form of a belief in the nation's exceptional or superior ability to lead the world and be a role model for other nations. American exceptionalism is often used in political discourse to refer to the idea that the United States is the world's leader and that it has the responsibility to enforce its values on other nations. The idea of American exceptionalism has been used to justify the expansion of the United States' power abroad.