Triple

Target entity: Progressive Era United States
Context triple: [Key West Extension, historicalEra, Progressive Era United States]

• A. Progressive Era chosen
  The Progressive Era was a period of widespread social activism and political reform in the United States, roughly from the 1890s to the 1920s, aimed at addressing problems caused by industrialization, urbanization, and political corruption.
• B. Republican era
  The Republican era was the period in Chinese history from the 1911 Xinhai Revolution to the establishment of the People’s Republic in 1949, marked by the rule of the Republic of China and significant political fragmentation, warlordism, and social transformation.
• C. Gilded Age
  The Gilded Age was a late 19th-century period in the United States marked by rapid industrialization, vast wealth accumulation, stark social inequality, and influential business magnates like Andrew Carnegie.
• D. The National Era
  The National Era was a 19th-century American abolitionist newspaper best known as the original serial publisher of Harriet Beecher Stowe's "Uncle Tom's Cabin."
• E. Reconstruction era
  The Reconstruction era was the period following the American Civil War when the United States attempted to reintegrate the seceded Southern states and redefine the legal and social status of formerly enslaved people.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.