Why did the US Supreme Court rule against the state of Tennessee in Baker v. Carr ?

Tennessee had not redrawn its legislative districts since 1901, even as population shifted toward cities. As a result, rural districts had far fewer residents per representative than urban districts, weakening the voting power of city residents. The Court ruled that challenges to this unequal representation could be heard by federal courts. The correct choice is that Tennessee had not redistricted since 1901, keeping rural districts in power.

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