From talking we SA's in various locations, it is my understanding that all of the US is in one system. In Europe, the systems are regional and, while they encompass multiple countries, they do not include all of Europe in one. I know my purchases in Denmark do not show up in the system with my purchases in the Netherlands.
My SA in Dallas said that I could just bring in my foreign receipts and they would add the items to my account to keep it up-to-date. I haven't actually done that though.