The idea that even large increases in international child adoption into the United States will somehow overwhelm other countries, or materially reduce the number of children available for domestic adoption in their home countries, is simply not supported by the facts. The difference between the vast number of orphaned and at-risk children and the incredibly low number of intercountry adoptions by American parents is too large to have an adverse effect on domestic adoption programs in other countries.
Source: Adoption Advocate No. 57: Reconsidering Intercountry Adoption: Who wants to Adopt and Who Could Be Adopted? Published March 2013 by Christopher Balding. Read more.