Which of these was signaled by Shi Huangdi's 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 not a sign of the end of the Xiongnu threat, a long period of internal peace, or the end of imperial expansion. Instead, it was a symbol of the triumph of imperial power over vassal power.<br />## Step 3<br />By destroying these fortresses, Shi Huangdi was asserting his imperial power and suppressing the power of vassals. This was a clear demonstration of the triumph of imperial power over vassal power.