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

Vietnam

According to Chapter I, Political System, Article 7 of the Vietnmaese Constitution the elections are held in accordance with the principles of universal, equal, direct and secret suffrage. Under Chapter II, Human Rights and Citizen’s Fundamental Rights and Duties, Article 27 citizens of the age of 18 have the right to vote (Constitute Project, “Vietnam’s Constitution of 1992 with Amendments through 2013”).

Voting Rights and Suffrage · Country sources (all rights) · Years mentioned: 1992, 2013 · Last edited 2022-12-28 · Edit on GitHub