In the U.S., those hoping to adopt have two basic options, whether choosing to adopt domestically (in the U.S.) or internationally (from another country):
Since adoption laws in the state where you live govern your options, it is essential that you know what types of placements are allowed or not allowed by your state’s laws. If you pursue an adoption across state lines, you must comply with the laws in both states before the child can join your family. States have enacted legislation that governs how children can be placed across State lines (Interstate Compacts).
For international adoptions, your state laws, laws and regulations of the U.S. Citizenship and Immigration Service (USCIS, formerly INS), the U.S. State Department, and the laws of the specific country will apply.
and others.
Credits: Child Welfare Information Gateway (http://www.childwelfare.gov)