As a resident of Florida, I would NEVER adopt inside the U.S.
Do you realize that Florida has a rather new law that allows the birth mother 2 YEARS to change her mind on the adoption. Yes, she's even notified of the hearings (one is at 6 months, etc) and at that time she can approach the court and ask that the adoption be null and void.
THAT may be why many Americans want to adopt outside the U.S. The odds of a poor Chinese or Korean woman knocking on a door demanding "her" children back is so remote it's a foolish concept. However, the possiblity of a U.S. biological mother changing her mind (or the previously unknown or simply undocumented father of the child changing his mind) is a REAL POSSIBLITY.
Many aren't read to gamble with an adoption. They want a sure thing. You can't blame them. We've all head and seen the real-life adoption nightmares where 3-yr-olds have been returned to the biological parents!