First, let me suggest that you read the "Samoa Adoption Notice" on the website of the U.S. State Department. To see it, go to
http://travel.state.gov. Click on "Children and Family" at the top of the page. Then click on "Important Notices" on the left side of the page.
As you will see, it says that delays in the adoption process for Samoa are occurring, because the U.S. is investigating each adoption case to ensure that all of the adoptions meet the requirements of U.S. law. The person doing the investigation, which involves interviewing the birthmother of the child to be adopted, among other things, is based in New Zealand. This person cannot visit Samoa frequently, so investigations may not be completed promptly.
In terms of finding a licensed, nonprofit agency with which to work, there are very few. Put the term "adoption agencies placing children from Samoa" into your browser, and you'll find them. But be very careful to check them out carefully, or you could wind up being unable to bring home a child.
Sharon