And it was a generational oddness, those men's fathers and grandfathers might have felt the loss, but they themselves would be far more concerned about Asia and Africa. Yes, I quite agree.

However, in a way, it was a very authentic touch as Conan Doyle often had American plot insertions. I think on the one hand that he had a genuine fondness for the place (he travelled there widely) and on the other hand, he had a fine authorial appreciation for the marketing opportunities allowed there. Perhaps both can also be allowed for Mr Ritchie?