There is NO Tibet.
Tibet doesn't exist anymore. It's gone. That land makes up 1/3 of China's territory. Tibetians number around 6 million or so, and China's population is over 1.2 Billion. Does anyone really think that a country with a population crunch as great as China is going to give up a 1/3 or its territory to 6 million people? It isn't going to happen. China's leaders aren't spineless wimps like those in most Western nations.
