solarz
Brigadier
Tibet was, in fact, independent for most of the early 1900s, which I think is what many Americans refer to, when they think of Tibet as an independent nation invaded by China. During this period, many provinces and local warlords were de facto independent from Beijing and governed their own little "countries". Tibet was reclaimed along other warlords and separatists in the latter 40s. However, during their short run of full independence, Tibet also signed a deal with Great Britain to cede a large swathe of land in southern Tibet (known as Arunachal Pradesh in India) to the British Crown. China of course doesn't recognize this deal as it doesn't recognize Tibet's legitimacy to sign such a treaty, hence there is a large amount of disputed territory around Tibet today.
Yes, that's the "independence" that Tibet Separatists love to crow about. Of course, when they claim that the PRC "invaded" Tibet in the 1950's, they conveniently ignore the fact that the ROC also claims Tibet as a part of China.