Amerasians

Amerasians: An alien who, as of December 22, 1987, lives in Vietnam and proves that they were born in Vietnam between January 1, 1962 and January 1, 1976, and are the child or spouse of a citizen of the United States are accompanying or plan on joining said US citizen.

Learn more at: https://fas.org/sgp/crs/row/R41570.pdf (Page 3-4)