How and why did the goals of the US foreign policy change from World War 1 to the Korean war?

The goals of U.S. foreign policy shifted from a focus on isolationism and promoting democratic ideals after World War I to a strategy of containment and active engagement during the Korean War. After World War I, the U.S. sought to avoid entanglement in European conflicts, exemplified by its reluctance to join the League of Nations. However, by the time of the Korean War, the onset of the Cold War prompted the U.S. to contain the spread of communism, viewing military intervention as necessary to protect global democracy and U.S. interests. This marked a transition towards a more interventionist and proactive foreign policy approach.