Originally, there were supposed to be more crossovers (like 4-5), and Remus was supposed to go to other countries too, but the plot grew too big and forced the crossovers into submission so I just stuck with America.
And while I love the idea of him coming to America, though I do confess to the practical part of it, too. Writing on this kind of schedule leaves almost no time for research (if you're a slow writer, like me). If I stuck with America, I know the school systems, geographical stuff, etc etc, without having to look up TOO much... *G*