The Neutrality Acts passed by the United States as part of a policy of isolationism during the 1930s were, in part, a response to

The foreign policy of isolationism has been one of the proprietor policies of the United States during the early 1930's in order to let them focus more on their interior proceedings. In addition to that, the Neutrality Acts were eventually passed in response to the growing tension in the Asia and Europe leading to a second world war.