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 apathy
Voter registration in the United States is an independent responsibility, so citizens choose whether they want to register or not. This led to only 64% of the voting age population being registered to vote in 2016. The United States is one of the sole countries that requires its citizens to register separately from voting. The lack of automatic registration contributes to the issue that there are over a third of eligible citizen in the United States that are not registered to vote.