It was June 1938 when we departed from Earth, and not much time seems to have passed when Kal-El’s ship brings us back home. Our hero’s formative years are therefore set in the era during which, in real life, the first Superman comic was published.
Superman was developed in response to the social and political themes of that decade: poverty, inequality, international tension. Instilled with classic American (ie. Midwestern) values, the first superhero was equipped to face all of the issues and more. Act 2 of Superman defines those values.