There are quite a number of large issues to be considered when looking at the effects of WWI on the social atmosphere in the United States. The backlash against Europe and outsiders of any kind after even the small (compared to European nations) number of casualties the US suffered in the war led to anger and resentment towards immigrants of almost every nationality and led Congress and Roosevelt to push for tighter immigration quotas and other measures designed to limit the influx of foreigners.
There was an increase in the sense of isolationism, not just in the political sense, but also in the idea of communities taking care of their own and not worrying about everyone else.
There was a great deal of racism and classism introduced into the world of college admissions, something detailed in the book titled "The Chosen" by Jerome Karabel.
You could also look at whether or not the rowdiness of returning soldiers, etc., led to more of the push towards prohibition. There were other effects from the return of boys from overseas having seen the horrible nature of war, there was a surge in the membership of peace advocacy groups, etc.