Publish America (previously AmErica House) is a Vanity Press/Publish-On-Demand Press (A Printer), not a commercial publisher like Random House or Penguin. There is also PublishAtlantica (formerly PublishBritannica) and PublishIcelandica.
Bookstores and Libraries WILL NOT stock Publish America books (or very, very, very, rarely do).
Publish America WILL NOT promote your book. YOU are responsible for 100% of the promoting.
You will have to BUY your OWN books for book readings, book signings, and promotion.
Your family and your friends will be encouraged/hounded to buy your book. YOU will be encouraged/hounded to buy your OWN book.
You WILL NOT get rich, and you will go broke trying to get rich.
Your press releases are order forms, and newspaper editors WILL NOT print the releases in their newspaper.
Your book WILL NOT be properly edited before going to print.
Your book will be OVERPRICED.
It is likely that bookstores WILL NOT want to set up book signings with you.