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.
Expatriation Act of 1907
This act was an attempt by Congress to resolve issues related to the status of citizenship, including those Americans living outside the United States, married women, and children born outside the country to American citizens. A particular concern during the last half of the nineteenth century was that of dual citizenship. During this period, several countries had established laws which gave their nationality to alien wives of male citizens. Did this then grant dual citizenship to American women married to men from these countries?