They probably say that because New Line is an American production company, but really I don't see this as an American Film at all, it's definitely an International effort by way of New Zealand. Honestly, NZ is on my top 5 places to visit before I die because of these films. It looks beautiful there.
Thank God Jackson took this project to New Line instead of having Weinstein convince him to do it in two films for something like 150 million.