The United States is one of the pioneers of the entertainment world and has the largest number of actors and actresses for the entertainment industry.
It's the same in the AV industry. Starting from the 1900s until now, the United States has also created a lot of very talented actors and actresses.
AV industry is not necessarily always unethical or demeaning.
In fact, many actors/actresses have a better quality of life, have the same or better levels of self-esteem, social support systems, and better spirituality.