During the 1930s, the combination of the Great Depression and the memory of tragic losses in World War I contributed to pushing American public opinion and policy toward isolationism. Isolationists advocated non-involvement in European and Asian conflicts and non-entanglement in international politics.
Answer:
Mass society theory
Explanation:
Mass society theory states that the individual which feels less valued starts believing in ideals in order to find a sense of belongingness. This happens when the individual feels helpless and are in despair.
The ideals that are followed are extreme which causes harm to the individual. Hence, the statement here is referring to Mass society theory.