Having distinguished between nationality and citizenship, note should be made of the specific ideas and context of citizenship itself. This is important not only because citizenship status is so closely related to nationality, but because it is possible to imagine that the two concepts may merge, or draw further apart, in the future.
In most countries, attribution of nationality by the state means possession of citizenship and the rights attached, with notable exceptions, such as the United Kingdom. Just as the attribution of nationality at international law is a matter left to states, so is the attribution of citizenship. As presented above, the effects or consequences of nationality are not the same as the effects and consequences of citizenship. Some countries extend many of the rights usually associated with citizenship to non-nationals/citizens, usually permanent residents. Possession of the status of citizen does however not necessarily mean that citizenship rights or entitlements can be exercised. For example, in many countries citizens resident overseas cannot exercise their franchise in their home countries.
On the other hand, citizen status, or even permanent resident status, can produce obligations that must be fulfilled, simply on the basis of that connection. In the United States, the obligation to file an income tax return applies not only to permanent residents of the country, a typical provision in tax laws, but to all citizens of the United States, regardless of their place of permanent residence. The obligation of military service is a similar category, although state practice would seem to be moving toward a more defined link based on age and residence, in addition to citizenship status or nationality.
In order to present a picture of current state practice toward multiple nationality, in addition to a review of municipal legislation, state policy must be examined. It was outlined that the policy that would be addressed is only that which directly relates to multiple nationality, as opposed to the many areas of municipal law that are arguably affected by multiple nationality, considerations which can often be labeled as related to citizenship. In this sense the separation of the two areas seems more difficult. Because the two categories are so closely woven together in much municipal legislation, one is confronted with the issue of whether in terms of policy they can in fact be separated. For example, where authors do not specifically differentiate between nationality and citizenship, their analysis must be considered to reflect the fact that some of the factors that states incorporate into their municipal laws on acquisition and loss of nationality arguably have to do with the exercise of rights and performance of duties belonging to citizenship, as opposed to nationality, yet the state labels them as the same thing.