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.

The Panama Canal was a transformative engineering project that connected the Atlantic and Pacific Oceans, reshaping global trade and naval power. After a failed French attempt, the United States successfully completed the canal by overcoming major challenges, including disease and difficult terrain. Opened in 1914, the canal symbolized American technological capability and growing global influence, while also raising questions about power and intervention abroad.

The Spanish-American War of 1898 marked a major turning point in U.S. history. Triggered in part by the explosion of the USS Maine and rising tensions in Cuba, the war led to a quick American victory over Spain. As a result, the United States gained overseas territories such as Puerto Rico, Guam, and the Philippines, transforming it into a global power. However, this expansion sparked debates about imperialism and challenged the nation’s founding ideals of freedom and self-determination.