What pact signed in 1949 reinforce that the united states would not return to an isolationist policy?

The NATO Agreement was the pact that was signed in the year 1949 that helped reinforce that the United States of America would not return to an isolationist policy. The full form of NATO is North Atlantic Treaty Organization and it was signer between United States, Canada and several other Western European nations.

An elector in the electoral college.