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4 64–67 (1910). But it was not until the turn of the 20th century, as part of the Progressive agenda of the era, that direct lawmaking by the electorate gained a foothold, largely in Western States. See generally Persily, The Peculiar Geography of Direct Democracy: Why the Initia­tive, Referendum and Recall Developed in the American West, 2 Mich L. & Pol’y Rev. 11 (1997).

The two main “agencies of direct legislation” are the initiative and the referendum. Munro, Introductory, in IRR 8. The initiative operates entirely outside the States’ representative assemblies; it allows “voters [to] petition to propose statutes or constitutional amendments to be adopted or rejected by the voters at the polls.” D. Magleby, Direct Legislation 1 (1984). While the initiative allows the electorate to adopt positive legislation, the referendum serves as a negative check. It allows “voters [to] petition to refer a legislative action to the voters [for approval or disapproval] at the polls.” Ibid. “The initiative [thus] corrects sins of omission” by representative bodies, while the “referendum corrects sins of commission.” Johnson, Direct Legislation as an Ally of Representative Govern­ment, in IRR 139, 142.

In 1898, South Dakota took the pathmarking step of affirming in its Constitution the people’s power “directly [to] control the making of all ordinary laws” by initiative and referendum. Introductory, id., at 9. In 1902, Oregon became the first State to adopt the initiative as a means,