Qin Shihuangdi unified China by introducing one currency throughout the empire, building roads, and a canal connecting the Chang Jiang in central China
Qin Shihuangdi helped protect China by building The Great Wall to fend off invaders like the Xiongnu and by increasing China's wealth through infrastructure projects
Han Gaozu's policies were similar to the Qin Dynasty as both used censors, but they differed in that Han Gaozu brought peace and prosperity to his reign