When cars were invented, someone might have thought that there would be other jobs for horses. Quote from Wikipedia: "There were an estimated 20 million horses

When cars were invented, someone might have thought that there would be other jobs for horses. Quote from Wikipedia: "There were an estimated 20 million horses in March 1915 in the United States.[36] But as increased mechanization reduced the need for horses as working animals, populations declined. A USDA census in 1959 showed the horse population had dropped to 4.5 million"...