This division of the American population happened because of the Prohibition
Instead of ending addiction, poverty and corruption, as its supporters wanted, the Prohibition that was in force in the 1920s in the country led to an increase in drunkenness and crime rates. The consumption of alcohol purchased on the black market, which is stronger and of lower quality, has led to thousands of deaths and problems such as blindness or paralysis.
In general the Americans met on opposite sides, both politically and socially at that time because of the law, which lasted for a time until after many protests the law ended.