Progressive Era: A period of social activism and political reform in the United States that lasted from the 1890s to the 1920s, with the goal of addressing the social, political, and economic problems associated with industrialization and urbanization.
Dollar Diplomacy: A foreign policy approach implemented by President Taft that sought to further American commercial and financial interests abroad by encouraging U.S. private investment and involvement in other countries.
Spanish-American War: A conflict in 1898 between the United States and Spain that resulted in the U.S. acquisition of territories including Puerto Rico, Guam, and the Philippines, marking the emergence of the United States as a major global power.