The 1920s saw a period of economic prosperity in the United States following World War 1. The development of new industries like automobiles, radio, motion pictures, and electricity created many new jobs and opportunities which drove economic growth. Henry Ford's assembly line techniques made cars more affordable and accessible to the masses. Laissez-faire economic policies under Republican presidents promoted business growth with little government interference. However, social changes were also significant as women gained the right to vote and flappers rebelled against traditional gender norms.