Just one more thing to add. Some states require readoption while others just "recognition of foreign adoption". Once that is completed you file the N600 with your local USCIS office (same office as you filed your I600A) and then you wait... and wait... and wait...
Here is the link for a website that should help. Good luck!
http://naic.acf.hhs.gov/general/lega...ernational.pdf