gremlin/Getty images Before the invention of the internal combustion engine and the harnessing of electricity, humans weren’t the only members of the global workforce . Until the mid-20th century, horses were employed in the tens of millions across industries. In the USA alone their numbers reached 24 million, about as many as there are humans currently working in healthcare.
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"The draft animal population — the vast majority of which were horses and mules — grew six-fold between 1840 and 1900, from four to twenty-four million. […]
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