World War I led to significant changes in society. It was the greatest war the world had yet witnessed, and it destroyed the heroic ideals that had accompanied wars in the past. The horrors of the war led to disquiet among many types of people. Individuals began to question the foundations of society, morality, and their conception of the world. People also began to break away from old societal traditions, leading to a looser, freer society. Wartime technology led to advances in transportation and communication at home and abroad. Literature, such as Sinclair Lewis' Babbitt, reflected the disillusionment with society.
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Einstein’s theory of relativity or Freud’s theory of psychoanalysis influenced the postwar era.
The horrors of war contributed to an atmosphere of anxiety and uncertainty about the world.
Wartime technology contributed to increased mobility and communication.
Many in society began to reject old traditions.