The roots of modern stand-up comedy began in 1840s minstrel shows that perpetuated racist stereotypes in the United States. American vaudeville emerged around the same time and along with the later developed Chitlin' Circuit, produced the founders of this form of entertainment. Early stand-up comedians spoke directly to the audience as themselves without props or costumes, which distinguished these acts from vaudeville performances. These comics stood in front of the curtain during their shows, like early 20th century "front cloth" stand-up comics in Britain and Ireland whose numbers allowed the stage behind them to be re-set for another act.