The law of the Ley del Referendum Nacional (Law of the National Referendum), passed in 1945 approved for all "fundamental laws" to be approved by a popular referendum, in which only the heads of families could vote.
Zakonom o državnom referendumu (Ley del Referendum Nacional), donesenim 1945. godine određeno je da svi "temeljni zakoni" trebaju biti odobreni referendumom, na kojem samo glave obitelji mogu glasati.