The international treaty among Convention member countries provides a framework to ensure certain intercountry adoption protections: providing adoptees with permanent and loving homes; looking after children's best interests throughout the process; and preventing the abduction, sale or illegal traffic of children.
Prospective adoptive parents are encouraged to visit and download the forms and filing instructions and Hague Adoption Convention Fact Sheet, available on the Internet at www.uscis.gov.
More at USCIS.gov