Where do I find a list of books which are (at the moment) banned in the United States?
There is no “list” of banned books. The United States Federal government does not ban books. Local governments can choose which books they want to keep in public libraries, and are free to choose Not to purchase certain books. In some cases, they might purchase the book, but keep it “behind the counter” in order to keep small kids from encountering adult content. This is how democracy works. If a person or group has a problem with a book, be it “Heather has Two Mommies” or “American Psycho”, they are allowed to express those concerns. If enough of their neighbors agree with them, then thay may choose not to fund their local library’s purchase of it. The Library of Congress may also decline to purchase a book, if it is deemed obscene, or has no redeeming artistic value, then why waste limited space and money, and by purchasing it implicitly approve of it?