To what extent is world war 1 seen as a turning point in united states foreign policy

It was highly affected as the United States adopted the policy of isolationism.

Explanation:

After the world war 1 got over, the United States of America adopted the policy of isolationism as it's foreign policy. Under the policy of isolationism, the nation totally got neutral with the internal affairs of the other countries of the world and did not want to interfere in any of the matters of any country of the world. It did not even let other countries of the world interfere in it's own matters.

it required the unanimous approval of the states before the congress could enact any measure.