First, in the northwest, sending Zhang Qian to the Western Regions was the first time in China's history to visit a foreign country and communicate with the small countries in the Western Regions at that time, which laid the foundation for the small countries in the Western Regions to become vassal countries of China.

Second, in the north, the Huns who attacked the north pushed the northern border of the Han Dynasty from the north of the Great Wall to today's Mongolia, completely defeating the Huns who had been strong for a hundred years in exchange for the long-term stability of the north for future generations;

The third is the southeast, which incorporated South Vietnam (now Zhejiang and Fujian) and incorporated it into the territory.

During the Hanwu period, ............ expanded its territory on a large scale through diplomacy and force for the first time in Chinese history. Therefore, the San Zi Jing describes his greatest achievements here with the most incisive words.