The U.S. state of Wyoming has had a system of direct voting since 1968, when voters adopted a constitutional amendment allowing measures to be placed on the ballot.
Wyoming's ballot measure procedure has been described by the Initiative & Referendum Institute as "one of the most onerous" in the nation.
[1] In order to place a citizen-initiated initiative on the ballot, measure sponsors must gather signatures equal to 15% of ballots cast in the previous election, along with at least 15% of voters in two-thirds of Wyoming counties.
These requirements, coupled with the legislature's ability to remove ballot measures if they adopt a substantially similar law, make placing measures on the ballot exceptionally difficult.
[1][2]: 33–34 As a result, most measures voted on in the general election are placed on the ballot by the legislature, not the voters.