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Image of a pregnant woman with large sack on her back, leaning against a barrel during the 1904 Stockyards Strike, Chicago, Illinois, between July 7 and September 9, 1904. The stockyards were owned by the Union Stock Yard and Transit Company of Chicago. (Photo by Chicago Sun-Times/Chicago Daily News collection/Chicago History Museum/Getty Images)

Image of a pregnant woman with large sack on her back, leaning against a barrel during the 1904 Stockyards Strike, Chicago, Illinois, between July 7 and September 9, 1904. The stockyards were owned by the Union Stock Yard and Transit Company of Chicago. (Photo by Chicago Sun-Times/Chicago Daily News collection/Chicago History Museum/Getty Images)

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Two women of Ryazan, Central Russia, 1912 From The Living Races of Mankind, Vol. II. [Hutchinson & Co, London, 1912]. Artist J Daziaro. (Photo by Print Collector/Getty Images)

Two women of Ryazan, Central Russia, 1912 From The Living Races of Mankind, Vol. II. [Hutchinson & Co, London, 1912]. Artist J Daziaro. (Photo by Print Collector/Getty Images)

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Three people, including a pregnant woman, as they pose outside a building with a porch, beside a horse-drawn cart, 1910. (Photo by Transcendental Graphics/Getty Images)

Three people, including a pregnant woman, as they pose outside a building with a porch, beside a horse-drawn cart, 1910. (Photo by Transcendental Graphics/Getty Images)