Automatic U.S. Citizenship for Children Born to or Adopted by Citizen Parents (Acquisition)
Child Born Between November 14, 1986, and June 11, 2017
If at the time of your birth, both your parents were U.S. citizens, married, and at least one had a prior residence in the U.S., you automatically acquired U.S. citizenship with no other conditions for keeping it.
If your parents were married, but only one parent was a U.S. citizen at the time of your birth, that parent must have been physically present in the U.S. for at least five years before your birth, and at least two of those years must have been after your parent reached the age of 14.
If your one U.S. citizen parent is your father and your birth was out of wedlock (took place while your parents weren't married), the same rules apply, provided you were legally legitimated (your father acknowledged paternal responsibility) prior to your 18th birthday.
If you were born out of wedlock and your one U.S. citizen parent is your mother (or if your father was a U.S. citizen as well, but you were not legally legitimated), your mother will need proof that she has one year of continuous physical presence in the U.S. prior to your birth.