The Tang Dynasty, as a powerful era in Chinese history, was renowned for its vast territory, politically stable governance, economic prosperity, and cultural flourishing. During its heyday, the Tang Dynasty's influence spread throughout the world, making it one of the most powerful countries in the world at that time. In terms of military conquests, the Tang Dynasty successfully annexed multiple countries through a series of wars and diplomatic means, further expanding its territory.

During the reign of Emperor Taizong Li Shimin, the Tang Dynasty embarked on large-scale military expansion. He first quelled the Turk rebellion within the country, solidifying the northern border of the nation. Subsequently, he turned his sights towards the West, initiating a war against the Gaochang Kingdom. In 640 AD, the Tang army conquered Gaochang, incorporating it into the Tang territory and establishing the Anxi Protectorate, a significant step in the Tang's westward expansion.

Following Gaochang, the Tang army went on to conquer the Western Turks, Xueyantuo, and other countries, bringing today's Xinjiang region under Tang rule. These victories not only strengthened the Tang's border security but also brought rich resources and strategic advantages.

Apart from its expansion in the northwest, the Tang Dynasty also demonstrated its military might in Northeast Asia. In 668 AD, the Tang Dynasty, along with the Shilla Kingdom, jointly annexed the Goguryeo Kingdom located on the Korean Peninsula. This victory peaked the Tang's influence in Northeast Asia.

However, the Tang Dynasty's strength did not solely rely on military conquests. Culturally, the capital Chang'an became one of the largest international cities in the world, attracting numerous foreign merchants, scholars, and religious missionaries. Economically, the Tang implemented various reform measures to enhance agricultural productivity and promote commercial trade. Politically, the Tang established an effective bureaucratic system, ensuring the country's long-term stability.

Despite its military achievements, the Tang Dynasty did not adhere to a consistent aggressive policy towards its neighbors. Instead, it often preferred peaceful diplomatic means to handle relations with neighboring countries. For instance, through marriage alliances, tribute systems, and other methods, the Tang maintained long-term peaceful relations with surrounding countries such as Tubo, Shilla, and Japan.

In conclusion, the Tang Dynasty's strength lay not only in its military conquests but also in the comprehensive enhancement of its overall national strength. During its heyday, the Tang Dynasty did annex multiple countries, but these conquests occurred against a specific historical background and complex geopolitical environment. The history of the Tang Dynasty teaches us that a country's strength requires support from various aspects, including political wisdom, economic prosperity, cultural inclusivity, and military might.

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