According to the article “The World Beyond China”, the information about the Han's neighbor tribes provided Emperor Wu a critical advantage and indicated why the Han grasped the central power.
The source emphasized on different cultures, lifestyles, legal systems, and military systems among those tribes. It enabled the Han dynasty to develop a particular plan to a specific opponent. As shown in the source, the Xiongnu used different weapons for different distance. Acknowledging of this, the Han could train its soldiers and developed an efficient battle plan. Besides, knowing that fighting appeared to be the Xiongnu people's nature and their personal profit were determined by the enemies they killed, Emperor Wu should avoid fighting with the