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SAT US History Practice Question

Which factor contributed most to the rise of membership in labor unions between 1915 and 1920?

  1. A.The efforts of progressive reformers
  2. B.The expansion of the open shop
  3. C.The fire at the Triangle Shirtwaist Company
  4. D.The passage of the Fourteenth Amendment
  5. E.The exclusion of unskilled workers

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