containment or rather cold war was established by US and its allies after the word war 2 to stop communism.
Explanation:
Containment was a policy of the United States of America, introduced at the start of the Cold War and aimed at stopping the spread of Communism and keeping it contained within its current borders of the Union of Soviet Socialist Republics instead of spreading the war in Europe.The United States feared that the communism of the USSR would spread from one country to the next, destabilizing one nation which would destabilize the next and allow for communist regimes to dominate the region.
