Question

What pact signed in 1949 helped reinforce that the United States would not return to an isolationist policy

Answer 1

Answer:The NATO agreement!

Step-by-step explanation:

Answer 2

The North Atlantic Treaty Organization (NATO /ˈneɪtoʊ/; French: Organisation du Traité de l'Atlantique Nord; OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949. The organization constitutes a system of collective defence whereby its member states agree to mutual defence in response to an attack by any external party.