Why do the Chinese think that Tibet is theirs??

You are a free thinker....in US you may be free to express your ideas and create a little stir......but in the rest of the world it doesn't work the same.......small stirs can create rebellions, wars and separartion of terrotories in multiple parts creating issues for big nations......Puerto Rico is economically and military wise very poor.....therefore i would believe it maybe not a big issue if it breaks away from, as US is vice versa to it..... but in China any break up might lead to large break ups and thus anarchy, chaos etc....this creates issues for all concerned.....let me give you a real life example.....Yugoslavia...currently Serbia, Kosovo, Bosnia, Croatia, Montenegro, macedonia etc....this anarchy and chaos which is intact only on the interference of external powers.......and will not last for long....when another war engulfs this once single nation of multiple faiths, ethnicity etc.....so take a look at this picture... is a nation or land united better for all......or broken held by others.