There's absolutely no doubt that all the components were made overseas, the boards made and populated overseas, and probably the aluminum casing as well though

There's absolutely no doubt that all the components were made overseas, the boards made and populated overseas, and probably the aluminum casing as well though that is conceivably Made in USA. The glass might be made in USA, a lot of Corning was at least recently. It's final assembly, screwing the parts together. Gluing the screen. No screws in the screen, so perhaps Apple imagines that connecting cables and gluing the screen counts as assembly, and who is to say otherwise.