Which of these was signaled by Shi Huangdis destruction of fortresses across China? The end of the Xiongnu threat The triumph of imperial power over vassal power A long period of internal peace The end of imperial expansion

## Step 1<br />Shi Huangdi, the first Emperor of China, is known for his unification of China and the establishment of the Qin dynasty. He implemented a series of reforms and projects, including the construction of the Great Wall and the destruction of fortresses across China.<br />## Step 2<br />The destruction of these fortresses was a strategic move to consolidate his power and suppress potential rebellions. This action was not directly related to the end of the Xiongnu threat, a long period of internal peace, or the end of imperial expansion.<br />## Step 3<br />Instead, the destruction of these fortresses was a symbol of the triumph of imperial power over vassal power. This was because the fortresses were symbols of the power of local lords and vassals, and their destruction was a clear indication of the Qin dynasty's dominance over these local powers.