What was the us policy in the 20Th and 21St century?

U.S. policy in the 20th and 21st centuries has evolved significantly, characterized by a shift from isolationism to a more interventionist stance, particularly during and after World War II. The Cold War era saw a focus on containing communism through military alliances, economic aid, and direct intervention in conflicts around the globe. In the 21st century, U.S. policy has grAppled with terrorism, globalization, and shifting power dynamics, leading to military engagements in the Middle East and a re-evaluation of traditional alliances. Overall, U.S. foreign policy has aimed to promote democracy and maintain global stability, often balancing between intervention and non-interference.