... in response to citizenship, posted by david hagar on Jul 19, 2005Since you did not state the country I assume you mean the USA.
No, duel citizenship is allowed. Mrs. Gator (no, her first name is NOT Ali) is a US citizen but also retained her Colombian citizenship. If I decide to become a naturalized Colombian citizen I will retain my US citizenship.
However, most of the laws forbidding dual citizenship were struck down in 1967 by the US Supreme Court. The court's decision in this case, Afroyim v. Rusk, as well as a second case in 1980, Vance v. Terrazas, eventually made its way into the federal statute books in 1986; up till that time, the old laws were still on the books, but the State Department was effectively under court order to ignore them.
Rules against dual citizenship still apply to some extent to people who wish to become US citizens via naturalization. The Supreme Court chose to leave in place the requirement that new citizens must renounce their old citizenship during US naturalization. However, in practice, the State Department is no longer doing anything in the vast majority of situations where a new citizen's "old country" refuses to recognize the US renunciation.
The official US State Department policy on dual citizenship today is that the United States does not favor it as a matter of policy because of various problems they feel it may cause, but the existence of dual citizenship is recognized in individual cases. That is, if you ask them if you ought to become a dual citizen, they will recommend against doing it; but if you tell them you are a dual citizen, they'll usually say it's OK.