Dual citizenship is when a person has citizenship in more than one country
Some countries do not permit dual citizenship.
US Immigration Law offers dual citizenship under the condition that the non-citizen declares absolute allegiance to the U.S. The US requires that person to relinquish allegiance to any foreign state, nation, or sovereignty under oath.
Dual Citizenship is possible by following a formal process with strict measures for second citizenship. One can acquire dual citizenship if one of their parents are US immigrants.