| 15 May 1887 – 10 Jul 1887|| Switzerland|
Two referendums were held in Switzerland in 1887. The first was held on 15 May, asking voters whether they approved of a federal law on spirits, and was approved by 65.9% of voters. The second was held on 10 July, asking voters whether they approved of an amendment made to article 64 of the federal constitution, and was approved by 77.9% of voters and 20.5 cantons.
Swiss referendums, 1887 Wikipedia
The spirits referendum was an optional referendum, which meant that only a majority of the public vote was required for the proposal to be approved. The constitutional referendum was a mandatory referendum, which required both a majority of voters and cantons.