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Top Books on Reddit in 2018 rank no. 85
Kansans drank contaminated water for years. The state didn’t tell them.(r/politics)
The short answer is the Koch brothers and their libertarian ideology using Kansas and other interior states as a laboratory for their overarching plans to create a corporate oligarchy in America.
But the more nuanced answers can be found here – What’s the Matter with Kansas?: How Conservatives Won the Heart of America
(An excellent companion book is Democracy in Chains: The Deep History of the Radical Right’s Stealth Plan for America )
good for you for wanting to educate yourself about this stuff, seriously