I doubt that china would be able to take over the world because some countries have a more powerfull military than them eg the U.S and Russia. There would also alliences in order to stop china for example the U.S has an allience with canada and britian and with those three powers put in place I think that they would be able to stop the powerfull army of Japan. If china was able to take over Asia which would be pretty hard because of the countries in Asia eg Russia,Japan, Korea, India the rest of the world would be in pretty big trouble. However if that happened I am cetain that europe would declare war and with america being part in an allience with britian they would be dragged in to the conflict along with canada. Also becaue of australlian and british relations they would be dragged in to war thus leaving china tro crumble underv the weight of these powers