In the cold war begins which event proved that the policy of containment work?

The Berlin Airlift (1948-1949) is often cited as a key event that demonstrated the effectiveness of the policy of containment during the Cold War. When the Soviet Union blocked all road and rail access to West Berlin, the U.S. and its allies responded by airlifting supplies to the city, successfully preventing it from falling to communism. This operation not only upheld Western influence in Berlin but also showcased the determination of the West to resist Soviet expansion, reinforcing the commitment to containment.