User blog comment:PhoenixRising101/One Piece Tech/@comment-4783583-20120226021755

uhm, this has actually been explained people, the isolation of all the islands in the world (the one piece world exist mostly if not fully of islands) have ensured a lot of different technologies and a lot of different people, tribes and races in the world. This prosses if further by the unique weather and sea conditions that exist in the one piece world that further isolate islands making some prehistoric like little garden while making others like karakuri island extremely advanced.