It was the war that gave birth to modern warfare, introducing machine guns, artillery, and chemical weapons. With new technology, came the need for new tactics and old generals didn't do that, which led to the meat grinder of trench warfare.
How long is it? Might be able to help or try at lease
Answer: They blasted bootleggers, motion pictures and espoused a return to "clean" living. Appealing to folks uncomfortable with the shifting nature of America from a rural agricultural society to an urban industrial nation, the Klan attacked the elite, urbanites and intellectuals. Their message struck a cord, and membership in the Klan ballooned in the 1920s. By the middle of the decade, estimates for national membership in this secret organization ranged from three million to as high as eight million Klansmen.