The Constitution of Uruguay of 1997 refers to the Constitution of 1967 with several amendments.
Its actual name should be: the Constitution of the Oriental Republic of Uruguay, with the amendments as approved in popular plebiscites of 26 November 1989, of 26 November 1994, of 8 December 1996, and of 31 October 2004. The most relevant of them was that of 1996, which came into force on the following year; due to its changes to the electoral system, it is usually considered a new Constitution.
Until the 1994 general election, all the elective posts were voted on the same day, and there were multiple presidential candidacies in every party. But now, since 1999, mid-year primary elections are held at the beginning of the electoral cycle, in order to elect single presidential candidates for every party; in October, parliamentary and presidential elections are held; if no presidential candidate scores at least 50% of all votes cast, in November there is a second round of voting. Finally, in May of the following year, there are municipal elections.
On 26 October 2014, alongside the general election, Uruguay held a constitutional referendum on a proposed amendment to article 43 of the Constitution, lowering the age of criminal responsibility from 18 to 16. In the end, this proposal narrowly failed its approval.