Several major countries in the Western Regions in the Tang Dynasty

For most of the Tang Dynasty, the main regimes that controlled the western regions were Turkic, Uighur and Tubo in turn. If you want to be a small local government, such as the "Thirty-six Plans for the Western Regions" of the Han Dynasty, you need to read books like "The Tale of the Western Regions of Datang". It mentioned Shiguo, Guo Kang, Miguo, Cao Guo, Heguo, Anguo and Shiguo among the nine surnames of Gaochang, Ayani and Zhaowu. These small regimes have limited control and a small population, similar to city-states.