Polity Atlas
EstablishedSource attached · not independently reviewedCLM-0197 · as of 2026-10-23 · about: Initiative and referendum · Author: Polity Atlas editorial team

“South Dakota was the first US state to adopt statewide initiative and referendum, in 1898. California ratified initiative, referendum and recall on 10 October 1911 under Governor Hiram Johnson's Progressive majority.”

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