What would best explain the increased totals of all cars made in the 1920's?

The increased totals of cars made in the 1920s can be attributed to several key factors, including the advent of mass production techniques, particularly the assembly line pioneered by Henry Ford. This innovation drastically reduced production costs and time, making cars more affordable for the average consumer. Additionally, the rise of consumer culture and improved road infrastructure fueled demand, allowing more Americans to own and use automobiles for personal transportation.