Вранье все с самого начала. Попадая в США, ребенок получает гражданство, и государство следит за ним равно так же, как и ребенком, родившимся в США. Требования к родителям при этом - те же самые. А 400000 детей - это всего сирот, живущих в приемных семьях.

http://adoption.state.gov/adoption_process/who_can_adopt/eligibility.php

Like all Americans considering adoption, persons with disabilities and persons in certain protected categories (for example, age, sex, race, color, national origin, or religion) must also comply with three sets of laws in order to adopt: U.S. federal law, the laws of the child's country of origin, and the laws of your home U.S. state.

U.S. federal law does not prohibit Americans with disabilities or those in certain federally defined protected categories from being an adoptive parent. However, some countries or origin, for example, do forbid individuals with certain disabilities from adopting. Likewise, some countries of origin may restrict single parent adoptions. U.S. state law on the eligibility requirements for prospective adoptive parent(s) also varies. When deciding to pursue intercountry adoption, do your research. Find out your state's requirements and restrictions. We recommend viewing the section on U.S. state laws maintained by the Child Welfare Information Gateway.