Jamaica is clearly outstanding in some events, and not even a player in others. Show me a Jamaican of any note in the men's steeplechase, 5000, 10,000, marathon, pole vault, shot put, discus, decathlon. What impact have their women made at 5k, 10k, marathon, pole vault, shot, discus? For that matter they haven't exactly done anything worth writing home about in the 1500 or heptathlon. To say they are the greatest track AND field nation is to reduce the sport to a handful of carefully (and subjectively) chosen events which support your rather overblown assertion.