The age of the automobile …

… How the Car Created the Modern World. (Hat tip, Dave Lull.)

Things change because when problems arise, people work at solving them, and sometimes they arrive at solutions. The answer to the psychosocial and physical degradation brought on by too many people employing too many horses in the burgeoning Industrial Age was, of course, the development of the motor vehicle. Specifically, one powered by the internal combustion engine.