Why was the writing of Upton Sinclair significant to American consumers?
It shocked public opinion by revealing that canned meat could actually contain human flesh.
Upton Sinclair's The Jungle is a fierce piece of criticismof the scientific division of labor which turned workers into human robots. It showed to public ompinion that the working conditions were actually so poor that the workers might get their hands or arms chopped off.
The Pure Food and drug Act of 1906 was thus aimed at regulating the meat packing industry especially in Chicago. It was part of the Progressive Era which Theodore Roosevelt embodied