1) The 1920s saw major social and demographic changes in the United States, including women gaining more freedom and rights like voting as well as entering the workforce and pursuing higher education.
2) There was also large-scale migration from rural to urban areas, changing America from a majority rural to majority urban population and causing conflicts between traditional rural and new urban values.
3) In response to these changes, religious fundamentalism grew in popularity as a way for some to cling to traditional beliefs and values in the face of modernization. This led to cultural clashes like the Scopes Trial over teaching evolution in schools.