The United States emerged from its fight for independence by leveraging European rivalries and embarked on continental expansion driven by Manifest Destiny, a process that eventually intensified internal conflict leading to the Civil War.
Following the Civil War, rapid industrialization propelled the nation onto the world stage, fueled by naval expansionist theories and resulting in overseas territories, the Panama Canal, and interventionist policies in Latin America and Asia.
The 20th century saw the US definitively abandon isolationism through its critical involvement in two World Wars, its leadership in establishing the post-WWII international system, and its subsequent role leading the West during the Cold War against the Soviet Union, marked by containment, global alliances, proxy wars, and the nuclear arms race.
In the post-Cold War era, the US navigated its position as the sole superpower, initiated a global War on Terror after 9/11, and now faces a complex landscape defined by renewed great power competition, particularly with China, alongside ongoing debates about its global role.