Which western industry's union efforts led to legislation mandating an eight-hour workday in Idaho, Arizona, and New Mexico by the early twentieth century?

Question

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The mining industry's union efforts, particularly those of the Western Federation of Miners, were instrumental in pushing for labor reforms, including the eight-hour workday, in states like Idaho, Arizona, and New Mexico by the early twentieth century.

Which Western Industry's Union Efforts Led to Legislation Mandating an Eight-Hour