Isolationism is a term mainly used to denote a direction in foreign policy, which is based on the idea of not being involved in the affairs of other states, nations or peoples. When applied to economics, isolationism leads to autarky, by which external trade is minimized.
This political stance was embodied in the interwar era, between the 1920s and 1930s, for example with the Kellogg Briand Pact. This was an agreement by which America and other nations opposed the aggressive war in this treaty and labeled it illegal. They thus laid the foundation for the criminalization of aggressive war as described later in the principles used for the Nuremberg Trial.
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