What problems did muckrakers like Lincoln steffens write about

Muckrakers were journalists that wrote about political and economic corruption and social hardships that people in the USA were facing because of the rapid industrialization in major cities. They were the Whistle-blowers of the time.

Explanation:

Lincoln Steffens wrote and published "The Shame of the Cities", which focused on the social hardships people who lived in cities faced.

the answer is "focused on"

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