What is the oldest written source in this country that mentions this right?

Marshall Islands

According to Section 3, elections of the members of Nitijela shall be conducted via a secret ballot system based on universal suffrage of those who have attained the age of 18 years or greater unless they are certified insane or are currently serving time for a felony. (Constitute Project, “Marshall Islands’ Constitution of 1979 with Amendments through 1995”).

Voting Rights and Suffrage · Country sources (all rights) · Years mentioned: 1979, 1995 · Last edited 2022-12-28 · Edit on GitHub