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
Luxembourg has compulsory voting from the age of 18. A proposal by the government to introduce optional voting for those aged 16 and 17 was rejected by 81% of voters in a June 2015 referendum.