 It was also in the 1920s when Americans became so productive that they were able to finally have a day of leisure. That day became known as Saturday, a day off. Automobiles became much more widespread. This was the era of Henry Ford's assembly line. This was the era of Thomas Edison and invention. Race relations improved considerably. At the beginning of the decade, the Ku Klux Klan was on the march. By the end, it was greatly in decline.