Electoral system
Electoral rules place limits on suffrage and candidacy. Most countries's electorates are characterised by universal suffrage, but there are differences on the age at which people are allowed to vote, with the youngest being 16 and the oldest 21 (although voters must be 25 to vote in Senate elections in Italy). People may be disenfranchised for a range of reasons, such as being a serving prisoner, being declared bankrupt, having committed certain crimes or being a serving member of the armed forces. Similar limits are placed on candidacy (also known as passive suffrage), and in many cases the age limit for candidates is higher than the voting age. A total of 21 countries have compulsory voting, although in some there is an upper age limit on enforcement of the law. Many countries also have the none of the above option on their ballot papers.
Universal suffrage
Many democratic countries, for example the United Kingdom and France, have had colonies with citizens living outside of the mother country and have generally not been entitled to vote for the national legislature. A peculiarly complex case is that of Algeria under the Third French Republic: Algeria was legally an integral part of France, but citizenship was restricted (as in other French colonies proper) by legal status, not by race or ethnicity. Any Muslim Algerian could become a French citizen by choosing to live like one. As this required the person to resign jurisdiction under Islamic law in favour of French civic law, very few did. Among Muslims, such a change was considered apostasy from Islam, which was the dominant religion in Algeria. Colonists in America declared Independence from Great Britain citing "No Taxation Without Representation" as one of their main grievances. However, the newly established country did not extend voting rights in the United States beyond white adult male property owners (about 6% of the population), and did not grant its overseas citizens the right to vote in elections either, until the passage of the Uniformed and Overseas Citizens Absentee Voting Act in 1986.