AMERICA’S EXPERIENCE IN WORLD WAR I was exceptional. For much of the world, the Great War produced great destruction — blackened fields, ruined factories, and millions of casualties. But in the United States, war and prosperity marched hand in hand. America emerged from the war with the strongest economy in the world and a position of international preeminence.

Still, the nation paid a heavy price both at home and abroad. American soldiers and sailors encountered unprecedented horrors — submarines, poison gas, machine guns — and more than 100,000 died. But rather than redeeming the sacrifice of these men as Woodrow Wilson promised, the peace that followed the armistice tarnished it.

At home, rather than permanently improving working conditions, advancing public health, and spreading educational opportunity, as progressives had hoped, the war threatened to undermine the achievements of the previous two decades. Moreover, rather than promoting democracy, the war bred fear, intolerance, and repression that led to a crackdown on dissent and a demand for conformity. Reformers could count only woman suffrage as a permanent victory.

Woodrow Wilson had promised more than anyone could deliver. Progressive hopes of extending democracy and liberal reform nationally and internationally were dashed. In 1920, a bruised and disillusioned society stumbled into a new decade. The era coming to an end had called on Americans to crusade and sacrifice. The new era promised peace, prosperity, and a good time.