Jazz, flappers, rumble-seats, flagpole sitters, Rudolph Valentino and Lucky Lindy—these were the catch words of the Roaring Twenties. But so were the K.K.K., women’s suffrage, Sigmund Freud, Teapot Dome, and Black Tuesday. In this span between World War I’s Armistice and the Great Depression, Americans were kicking up their heels and making major changes in the country’s social and political structure, as shown in this witty, penetrating biography of this restless decade.