To stop the spread of communism after ww2 the us established a policy known as

ANSWER:

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.