This book is an analytical descriptive study that examines the evolution of United States National Security Strategy from the end of World War II through the Trump administration. It explores how American foreign policy shifted from the isolationism of the Monroe Doctrine toward a globalized approach necessitated by the Cold War and the emergence of the U.S. as a superpower. The authors detail specific presidential doctrines-ranging from Truman's "Containment" and Nixon's "Realism" to Carter's "Human Rights" and the modern paradigm shift of Trump's "Americanism"-to show how each leader built upon or departed from previous strategies to secure national interests.