Why did China attack Tibet if it was an independent country?

In the early 1700's, the Qing Empire invaded and conquered Tibet. If you're willing to enter into politically murky areas, Tibet may or may not have recognized Chinese rule to a certain extent before that. read more

China at its largest When that happened, the Republic of China was proclaimed but it soon fell to warlordism like it was 1990's Somalia. Tibet at this point ran itself as an independent county because no one had the military might to control all of China, much less its outer regions. read more

Some Chinese sources argue that Tibet was still part of China throughout this period. Some other authors argue that Tibet was also de jure independent after Tibet-Mongolia Treaty of 1913, before which Mongolia has been recognized by Russia. read more

Tibet was an independent state until the PRC invaded Tibet in 1949/50.Some Western scholars claim that Tibet and China were ruled by the Mongols during the Yuan dynasty,that during the Chinese Tibet was independent Ming dynasty (1368–1644) and that Tibet was ruled by Chinaor subordinate to the Qingduring much of the Qing dynasty.Some Western scholars also claim that Tibet was independent from c. 1912 to 1950, although it had extremely limited international recognition. read more