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.
Voter registration
In the UK voter registration is compulsory, but the requirement to register is rarely enforced.
The current system of registration in the United Kingdom (UK), introduced by the Labour government, is known as rolling registration. Electors can register with a local authority at any time of the year. This replaced the twice-yearly census of electors, which often disenfranchised those who had moved during the interval between censuses.