Depends on the book. For example, Joy of Cooking is pretty standard American and Italian/French-by-way-of-America fare (unsurprisingly, since it was first published in the US in 1931), while How To Cook Everything has a much wider remit.

Yes, in my expericen they all kind of do.

This doesn't mean that you won't find recipes from a foreigen cuisine in them. Most of them are however adapted to the cuisine the book is from.

Sometimes it's a recipe that is basically unknown in it's country of supposed origin (Spaghetti with meatballs).

But often they are only adapted to the different preference in taste, or the different things you will get at the grocery store.