What were the arguments of anti-imperialism? Why were some Americans against expansion?

The anti-imperialists opposed expansion, believing that imperialism violated the fundamental principle that just republican government must derive from "consent of the governed." The League argued that such activity would necessitate the abandonment of American ideals of self-government and non-intervention—ideals ... - Google

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the us constitution is a living document, meaning that it can be changed over time as the country changes.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.