Birth tourism
Some countries do not allow their citizens to renounce their citizenship or only if the citizenship was acquired by birth there to non-citizen parents. In Argentina, Brazil, Ecuador, Peru, and Uruguay, voting is compulsory for citizens. In Bolivia, Brazil, Chile, Colombia, Cuba, Guatemala, Paraguay, and Venezuela, military service is mandatory.
Voting age
Eighteen is the most common voting age, with a small minority of countries differing from this rule. Those with a national minimum age of 17 include East Timor, Greece, Indonesia, North Korea, South Sudan and Sudan. The minimum age is 16 in Argentina, Austria, Brazil, Cuba, Ecuador, Nicaragua and the Isle of Man, Jersey and Guernsey (three self-governing British Crown Dependencies). People aged 16–18 can vote in Bosnia, Serbia and Montenegro if employed. The highest minimum voting age is 21 in several nations. Some countries have variable provision for the minimum voting age, whereby a lower age is set for eligibility to vote in state, regional or municipal elections.