Final answer:
The Roaring '20s ended the Progressive Era by shifting society's focus to consumerism and economic growth, characterized by pro-business policies and reduced government spending on Progressive services.
Step-by-step explanation:
The Roaring '20s marked the end of the Progressive Era primarily by shifting the focus of society from Progressive reforms and worker's rights towards consumerism, economic growth, and mass production. Broadly speaking, Americans turned their attentions towards the promise of material wealth and prosperity, which was exemplified by the proliferation of consumer goods, advancements in technology like the automobile, and a nationwide consumer market. One key factor in this shift was the government's reduced intervention in progressive reforms and increased support for pro-business policies.
The correct answer to how the Roaring '20s marked the end of the Progressive Era is: O. Public officials cut taxes on businesses and reduced spending on services. The overarching spirit of the 1920s was marked by governmental policies focusing on business interests and economic expansion rather than the protections and reforms characteristic of the Progressive Era.