In the 26 referendums were some states voted Yes and others voted No, how many times did each state vote Yes in each of three eras?

Which states voted Yes in different eras?

In the 26 referendums were some states voted Yes and others voted No, how many times did each state vote Yes in each of three eras?

There were twelve split-result referendums in 1910-19, and seven each in the 1926-51 era and the 1967-84 era.
Chart: Ben RaueSource: Tally Room data repositoryGet the dataCreated with Datawrapper