<Li> Following the federalization of Czechoslovakia in 1968, Czechoslovak citizens also possessed an internal citizenship of either the Czech or Slovak Republic . Upon the nation's peaceful dissolution in 1993, this was used to determine whether they ought to receive Czech or Slovak citizenship . </Li> <Li> Before the break - up of Yugoslavia in 1991, Yugoslav citizens possessed an internal citizenship of their own republic (Serbia, Croatia, Bosnia and Herzegovina, Slovenia, Macedonia, Montenegro) as well as Yugoslav citizenship . In Serbia and Montenegro, this system was in effect until 2006 . </Li> <Li> When Singapore joined Malaysia in 1963, all Singapore citizens were granted Malaysian citizenship . Singapore citizenship continued to exist as a subnational citizenship, and continued to be legislated by the Legislative Assembly of Singapore subject to the approval of the Parliament of Malaysia . Upon Singapore's independence from Malaysia in 1965, Malaysian citizenship was withdrawn from Singapore citizens, and all Singapore citizens became citizens of the new Republic of Singapore . </Li> <Ul> <Li> In European Union law, there is the concept of EU citizenship which flows from citizenship of a member state . A citizen of an EU country is free to live and to work in another EU country for an unlimited period of time, but member states may reserve the right to vote in national elections, stand for national election, become a public servant in highly sensitive ministries (Defence for example), etc. only for their citizens, and in highly limited circumstances, may deport or refuse entry to citizens of other EU states . An EU state may place restrictions on the free movement rights of citizens of newly admitted states for several years, such provisions remain in force mostly for nationals of Croatia (no later than 2020); in the past, and to a lesser extent, such provisions also affected Estonia, Latvia, Lithuania, Poland, the Czech Republic, Slovakia, Hungary, Slovenia, Bulgaria and Romania . </Li> <Li> The United Kingdom recognises a Commonwealth citizenship for the citizens of the member states of the Commonwealth of Nations . The United Kingdom allow non-nationals who are Commonwealth citizens to vote and stand for election while resident there, while most other Commonwealth countries make little or no distinction between citizens of other Commonwealth nations and citizens of non-Commonwealth nations . </Li> <Li> Commonwealth of Independent States nations (the republics of the former Soviet Union) are often eligible for fast track processing to citizenships of other CIS countries, with varying degrees of recognition / tolerance of dual citizenship among the states . </Li> </Ul>

What countries does canada allow dual citizenship with