In 2011 really?

The U.S. Supreme Court has upheld a gender-based discrimination law that treats men and women differently when it comes to citizenship [...] Currently, children born overseas who have one U.S.-citizen parent can obtain U.S. citizenship if the citizen parent had been physically present in the U.S. for a certain period of time before the child’s birth, according to the Supreme Court's blog.

If the citizen parent is the father, the period is five years; if it is the mother, the period is one year. - from here