There are two things here. Title capitalization is definitely a part of English orthography. Any book you take, no matter what English-speaking country the auth

There are two things here. Title capitalization is definitely a part of English orthography. Any book you take, no matter what English-speaking country the author is from, will always use title case, unless it wants to make a point (avant-garde etc.). However, there are differences as to what deserves to be capitalized. Just the titles of books, films, etc? What about the titles of articles, are they in any way different, or maybe worse than the titles of books etc.? I guess this need for consistency pervades the American usage, codified in the CMoS and other style guides, and hence applied universally.