The "policy of containment" was a cornerstone of US foreign policy during the Cold War. Born from the anxieties surrounding the spread of communism after World War II, it aimed to prevent the Soviet Union and its ideology from expanding its influence beyond its existing borders. Think of it like this: imagine a spreading fire. Containment wasn't about extinguishing the fire where it already burned, but about building firebreaks to prevent it from engulfing neighboring areas.
Key to this strategy were various measures including economic aid (like the Marshall Plan), military alliances (such as NATO), and direct intervention in certain conflicts (e.g., the Korean and Vietnam Wars). The logic was that by strategically surrounding the Soviet bloc with strong, non-communist nations, communism would eventually stagnate and collapse from within. While controversial and costly, the policy of containment undeniably shaped global politics for decades and ultimately contributed to the end of the Cold War.