Since the Tang Dynasty, the Han nationality's regime seemed to have lost its ambition to expand its territory as in the past. What exactly caused this phenomenon? This article will analyze it from various aspects such as history, politics, and economy.

First, historical reasons:

1. The Tang Dynasty had vast territory, reaching the peak of Chinese feudal society. During the Tang Dynasty, China's territory stretched east to the Korean Peninsula, west to Central Asia, south to Indonesia, and north to Siberia. Such an extensive territory was difficult to surpass for later Han regimes.

2. After the Tang Dynasty collapsed, the fractured situation of the Five Dynasties and Ten Kingdoms led to frequent changes in political power and continuous wars. This situation made it difficult for each regime to focus on territorial expansion and they had to concentrate on maintaining their own ruling status.

Second, political reasons:

1. The Song Dynasty implemented a civil official system, emphasizing cultural education, which raised the status of the intellectual class. However, this also led to a relative weakening of military strength, reducing the willingness and ability to engage in foreign wars.

2. In the early Ming Dynasty, Zhu Yuanzhang implemented a strict maritime embargo policy, restricting sea trade and foreign exchanges. This greatly limited the Ming Dynasty's ability to expand territorially.

Third, economic reasons:

1. With the development of the economy, agricultural production gradually stabilized, and people's living standards continued to improve. Under such circumstances, rulers focused more on internal affairs and less on territorial expansion.

2. After the Song Dynasty, the commercial economy gradually emerged, and foreign trade became an important source of national finance. Therefore, rulers paid more attention to maintaining and developing foreign trade rather than expanding territory through military force.

Fourth, cultural reasons:

1. Confucian culture emphasizes "harmony is precious," advocating peaceful coexistence and opposing aggressive expansion. This cultural concept has had a profound impact on the Han regime's foreign policy.

2. The spread of religious beliefs such as Buddhism and Taoism made people pursue inner peace and transcendence more, rather than achieving personal value through conquering the world.

In summary, the reasons why the Han nationality's regime stopped expanding its territory after the Tang Dynasty mainly include historical, political, economic, and cultural factors. During this period, China's politics, economy, and culture underwent profound changes, which jointly influenced the Han regime's foreign policy.

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