Persons eligible for dual citizenship in both the United States and Canada acquire this status through birth, marriage or naturalization, according to The Law Dictionary. The first step to acquiring citizenship via naturalization in either country is to apply to become a permanent resident.
Both the United States and Canada allow for birthright citizenship, meaning anyone born within the country's borders is automatically a citizen, notes All Law. Having a parent who is a Canadian or American citizen can also allow citizenship. Marrying a citizen of either country is another path to citizenship, and both countries have active investigatory departments dedicated to policing marriage fraud.