This document provides an overview of changes in the foreign policies of great powers from the perspective of the United States as the world transitions to a multipolar order. It discusses the meaning of great powers and identifies the UN Security Council permanent members as great powers. It then reviews the evolution of U.S. foreign policy from the late 18th century through the post-Cold War period, highlighting increasing global engagement and the emergence of new doctrines like the Bush Doctrine in response to events such as 9/11. The document argues that while the U.S. remains influential, rising nations are challenging its dominance in a shifting multipolar world.