Citizenship of the United States
A person who is considered a citizen by more than one nation has "dual citizenship". It is possible for a United States citizen to have dual citizenship; this can be achieved in various ways, such as by birth in the United States to a parent who is a citizen of a foreign country (or in certain circumstances the foreign nationality may be transmitted even by a grandparent) by birth in another country to a parent(s) who is/are a United States citizen/s, or by having parents who are citizens of different countries. Anyone who becomes a naturalized U.S. citizen is required to renounce any prior "allegiance" to other countries during the naturalization ceremony; however, this renunciation of allegiance renunciation of citizenship to those countries.
Indian nationality law
In response to persistent demands for dual citizenship, particularly from the diaspora in North America and other developed countries, the "Overseas Citizenship of India" (OCI) scheme was introduced by amending "The Citizenship Act, 1955" in August 2005. The scheme was launched during the Pravasi Bharatiya Divas convention in Hyderabad in 2006. Indian authorities have interpreted the law to mean a person cannot have a second country's passport simultaneously with an Indian one — even in the case of a child who is claimed by another country as a citizen of that country, and who may be required by the laws of the other country to use one of its passports for foreign travel (such as a child born in the United States or in Australia to Indian parents), and the Indian courts have given the executive branch wide discretion over this matter. Therefore, Overseas Citizenship of India is not an actual citizenship of India and thus, does not amount to dual citizenship or dual nationality or anyone no longer to use Indian IDs after OCI. Moreover, the OCI card is not a substitute for an Indian visa and therefore, the passport which displays the lifetime visa must be carried by OCI holders while travelling to India. OCI Cards are now being printed without the lifelong “U” Visa Sticker (which is normally pasted on the applicant's passport). The proof of lifelong visa will be just the OCI Card which will have “Life Time Visa” printed on it. The OCI Card will be valid with any Valid Passport. However, countries may consider the OCI as dual citizenship: for example, the UK government considers that, for purposes of the British Nationality Act 1981, "OCI is considered to be citizenship of another State".