How insular do you have to be to theme s**t to your own f**king country?
To be fair, this isn't entirely unheard of. The various Disney parks have their Main Street USA (not to mention the various Hollywood parks), and there's hardly a park in that whole country without an Old West section. Alton Towers has its very English gardens (not to mention the castle). Hansa Park is themed to the Hanseatic League, very German. Phantasialand's main street is themed to Berlin. PortAventura has the Mediterranean section as its main entrance area. Hunderfossen is basically all about Norwegian folklore. Liseberg uses the viking theme a lot, plus a very Scandinavian architecture along its main street. The biggest coaster at Fuji-Q highland is simply named Fujiyama. "Build what you know" seems to be a recurring mantra all over the theme park industry.
That being said, most of those parks also have areas themed to other parts of the world, or otherworldly themes in general. I can't remember much of that from Chinese parks, but you know that topic a lot better than I do.