Just curious, why do people not adopt directly from this country (USA)?
They do.
If you are wealthy it is easier in this country.
I know of one couple that went through three heart breaking foster parenting experiences before they were given complete custody of
a little boy.
Each time they had intention of adopting an abused or neglected child
and each time the parents got the child back.
So, in answer to your question, it is more difficult and or, it is more expensive.
Do you watch NCIS?
There is a character in it that he and his wife want to adopt a child. They found a birth mother, probably paid for her medical expenses and then, after the baby was born, she decided to back out.
They have no recourse.
If they try to go through the foster system they will be going through the same thing possibly several times.
And even once the adoption is over you can not rest easy because the birth mother or birth father may decide to contest the adoption for whatever reason.
People get tired of being jerked around by the system. Once you start looking at it you realize, especially if you are an older couple that you will be much better off going overseas. Less heartbreak. Less time. And less money in the end.