Final answer:
Qin Shi Huang, the first emperor of the Qin dynasty, forced the Northern nomadic and tribal civilizations, led by the Chanyu Touman, to retreat north. He developed infrastructure for defense and built the Great Wall of China to protect against these tribes.
Step-by-step explanation:
Qin Shi Huang, as the first emperor of the Qin dynasty, implemented militaristic strategies that enlarged the bounds of Chinese territory. One of the major threats to his empire were the Northern nomadic and tribal civilizations, known to Chinese as the Hu (or Donghu) and Yuezhi, led at the time by the Chanyu Touman.
Qin Shi Huang initiated a campaign against these tribes, forcing them to retreat north. This necessitated the development of infrastructure, such as fortified towns and roads to transport Qin's armies. The emperor also defended against these “barbarians” by building the Great Wall of China, a series of defensive structures constructed by states in Northern China. As a historical precedent, successive empires in China also adopted similar wall-building strategies.
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