Many countries, other than the United States, usually restrict the opportunity for their people to become dual citizens. In the United States, however, there are no specific rules or laws that define the status of dual citizens. As a basic rule, a country is able to set laws only for people of its nationality, but not for people of nationality of any other country. And this is the main reason why the US allows a person to be a dual citizen.

At the same time, the US government, particularly, the United States Citizenship and Immigration Services, stipulates some rules that can lead to loss of dual nationality in your case.

For example, if you happen to work for a foreign government which requires you to accept the oath of allegiance to the foreign state, then your American citizenship can be revoked. But because the Citizenship Clause of the 14th amendment says that you cannot be deprived of US citizenship without your clear intent to lose it, you can keep your rights as a US citizen.

If you are a naturalized US citizen, you can nevertheless be a citizen of the country in which you were born. It is true that when you take the oath of allegiance to the US, you pronounce these words “…I absolutely and entirely renounce… allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen…” But you do not actually renounce your original nationality or citizenship status, only the “allegiance to any foreign state”. Therefore, after you successfully pass a naturalization test and take the oath of allegiance, you become a US citizen and a citizen of your original country.

So, why does the US allow dual citizenship? The answer is there are no strict rules or specific stipulations in American laws that prohibit dual citizenship. There are cases when your US citizenship can be revoked, but it is necessary to prove your real intents, which is difficult, to take away your citizenship rights.