Triple

Target class: Progressive Era ideology
Context triple: [New Nationalism, instanceOf, Progressive Era ideology]

• A. Progressive Era movement chosen
  The Progressive Era movement was a broad reform effort in the late 19th and early 20th centuries in the United States aimed at addressing social, political, and economic injustices through government regulation, social welfare programs, and expanded democracy.
• B. Progressive Era reformer
  A Progressive Era reformer is an individual active in the late 19th and early 20th centuries who sought to address social, political, and economic injustices through government regulation, social activism, and institutional change.
• C. 19th-century social movement
  A 19th-century social movement is a collective effort by groups of people during the 1800s to challenge and reform political, economic, or cultural conditions, often addressing issues such as industrial labor, slavery, women's rights, and national self-determination.
• D. liberal triennium
  The Liberal Triennium was a three-year period (1820–1823) in Spain during which a liberal constitutional government briefly replaced absolutist rule before being overthrown by French intervention.
• E. World War I-era polity
  A World War I-era polity is a sovereign or semi-sovereign political entity that existed and exercised governmental authority during the period surrounding the First World War (circa 1914–1918), shaped by the war’s diplomatic, military, and social upheavals.
• F. None of above.