The territory of the Tang Dynasty experienced a remarkable process from expansion to prosperity and then to reduction, and gradually divided in the later period, and the records of administrative divisions were very incomplete. However, the concept of "Tao" set in the early Tang Dynasty still influenced the later Song Dynasty and became the prototype of "Tao".
2. The Tang Dynasty has a vast territory. In the early days, the county was renamed as the state, and the chief was renamed as the history of the Han Dynasty, which became a first-level administrative division leading to the county and implemented a two-level system of state and county. However, at this time, the world is no longer the size of 36 counties when the Qin Dynasty was established, and the number of states has soared to more than 300, which makes the management of the central government very inconvenient. Later, this supervisory body was added to each county.
At the same time, there were frequent wars at home and abroad in the Tang Dynasty. In addition to the traditional states, prefectures and counties, there are many military-oriented organizational systems, such as customs, troops and prisons. We will set up prefectures in ethnic minorities and border areas, and strengthen management in Jimmy State under our jurisdiction. By the time the Tang Dynasty officially perished, there were already more than 40 Taoist and buffer regions in the world, most of which were under the jurisdiction of our envoys.
3. Historical evolution: The three-level system of state, county and county, which gradually took shape from the end of the Han Dynasty, went through sixteen countries in the Eastern Jin, Southern and Northern Dynasties and existed in name only in the Sui Dynasty. The Sui Dynasty abolished the county first, and soon renamed it as a state county, and restored the county system in the Qin Dynasty. In the first year of Zhenguan of Emperor Taizong (627), according to the conditions of mountains and rivers and convenient transportation, the world was divided into ten "roads", and inspectors were set up as needed to assist the central government in supervising state-level administrative regions.
In the twenty-first year of Emperor Xuanzong of the Tang Dynasty, it was further divided into fifteen channels, each with a visiting envoy, which only played a supervisory role, imitating the secretariat system of the Western Han Dynasty. After the Anshi Rebellion, the system of our time, which was originally used only in the border areas, was widely used throughout the country. Our time was generally awarded to the state for secretariat, so we mastered the military and political power of the state and even the surrounding States at the same time, and its jurisdiction was also called "Dao" or "Fan Town", becoming a first-class informal administrative region with actual power.
By the Yuanhe period in Tang Xianzong, the administrative regions in the world had been basically divided by our time, concept, strategy and defense, and the ten and fifteen roads in Zhenguan and Kaiyuan years had completely lost their practical significance. By the time of the official demise of the Tang Dynasty, there were already more than 40 Taoism and buffer regions in the world, most of which were under the jurisdiction of our time, and the separatist regime of the buffer regions eventually led to the demise of the Tang Dynasty.