Answer:
The answer is agriculture and mining.
Explanation:
Agriculture. Agriculture became the dominant industry of the American Great Plains and Canadian Prairies during the second half of the nineteenth century and the early decades of the twentieth century. Farming operations had, of course, been carried on in some parts of the Plains for many years.
Hope that helped.
You should look up Progressivism. Progressivists dealt with a lot of reforms in the early 1900s.
Alternatively, try looking up “US health bills since 1900.” If you need a starting point, look up the Pure Food and Drug Act/Meat Inspection Act (both in 1906) and Upton Sinclair’s “The Jungle,” which had a particularly large impact on meat inspection.
Answer:
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