1919, Prohibition, no legal sale of alcoholic beverages. Alcohol is not evil but people abusing it can be. They eventually see that it doesn't work and got rid of it.
1920, Women Suffrage
City Commission, a hurricane wiped out Galveston Texas in 1900.
It killed hundreds maybe even thousands of people. Got rid of the mayor and the council, way of government in this town, so they make a city commission. Specialized workers, they worked certain areas of the city.
These were the new child labor laws, etc. The 8 hour day becomes the national Norm.