Two referendums were held in Switzerland during 1918.
[1] The first was held on 2 June on introducing a direct federal tax, and was rejected by a majority of voters and cantons.
[1] The second was held on 13 October 1918 on introducing proportional representation for National Council elections, and was approved by a majority of voters and cantons.
[1] As a result, proportional representation was introduced in the 1919 elections.
[3] Full cantons counted as one vote, whilst half cantons counted as half.