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Books such as The Octopus by Frank Norris, How

the Other Half Lives by Jacob Riis, and The

Jungle by Upton Sinclair exposed problems

associated with

(1) naturalization of immigrants

(2) westward expansion

(3) rapid industrialization

(4) environmental conservation

Verified Answer :

Books such as The Octopus by Frank Norris, How the Other Half Lives by Jacob Riis, and The Jungle by Upton Sinclair exposed problems associated with "(4) environmental conservation."

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