Astrology treats the entire globe as one unit. Countries are man made and it is not endorsed by astrology. It is done for human convenience to ease administration. Nobody is a foreigner as per astrology. It can only differentiate between man or woman. A man marries a woman and vice versa. We ask for the birth place only to take the co-ordinates of planets at that place for evaluation of longitudes of all planets at the time of birth which is again calculated from Sunrise or Sunset. You can approach some wayside astrologers most of them fake ones to get an answer to your question.