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In this video:

Back in the late 19th and early 20th centuries as food began to be more and more mass produced and shipped long distances, instead of locally grown and sold fresh, it was basically the Wild West in regards to food production and there were no real official regulations on what you could add to food, or even that if you labeled something chicken, that it had to contain any chicken at all. And as there were also no rules about reporting any ingredients, businesses pretty much did whatever they pleased.

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Sources:

https://news.google.com/newspapers?ni...
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https://blog.history.in.gov/drharvey...
https://www.atlasobscura.com/articles...
http://pmep.cce.cornell.edu/profiles/...
https://www.theatlantic.com/science/a...
https://boingboing.net/2018/08/29/in...
http://mentalfloss.com/article/92217/...
https://en.wikipedia.org/wiki/Harvey_...
https://books.google.com/books?id=1fJ...
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https://en.wikipedia.org/wiki/Pure_Fo...
http://www.todayifoundout.com/index.p...
https://www.nytimes.com/2018/10/16/bo...
https://www.sciencefriday.com/segment...