Dual citizenship is when someone is a naturalized citizen of two countries at the same time. In the U.S., there are many ways in which a person can acquire dual citizenship. For some, the status is granted at birth. For example, those born in the United States to immigrant parents are automatically dual citizens. The same is true for someone who is born outside of the U.S. but has one parent who is a U.S. citizen and the other is a citizen or another country. In this instance, the child becomes a citizen of both countries.