The Roaring Twenties was a transformative decade in American history marked by economic growth, jazz music, Prohibition, organized crime, and rapid cultural change. Cities expanded, mass media connected the nation, and new ideas about freedom and identity emerged. While the era symbolized modernity and excitement, it also revealed deep social tensions and economic weaknesses that would eventually lead to the Great Depression.

World War I marked a turning point for the United States as millions of American “doughboys” traveled overseas to fight in Europe. Experiencing trench warfare, modern industrial combat, and foreign cultures for the first time, these soldiers helped transform America into a global power. The war changed not only international politics, but also how Americans understood their nation’s role in the world and their own identity within it.

During the Progressive Era, Theodore Roosevelt led efforts to regulate powerful monopolies, protect consumers, and preserve natural resources. By enforcing antitrust laws and responding to public concerns about unsafe industries, his administration expanded the role of government in maintaining fairness. This period marked a turning point in American history, as the nation began to balance industrial growth with social responsibility.