Analysis of information sources in references of the Wikipedia article "Warren County, Indiana" in English language version.
The universal embrace of the automobile in the 1920s contributed to the sharp decline of Main Street's independence and vitality ... The ensuing Great Depression ruthlessly exposed the vulnerability of small-town merchants ... The causes of decline are many and complex, but they are related to the continued accumulation of population, economic strength, political power, and social dominance by regional cities.