It was the site of the Han -- Xiongnu War until 89 AD .
Because of its strategic location astride the Silk Road , the Western Regions have been historically significant since at least the 3rd century BC .
Western Regions was the site of the Han -- Xiongnu War until 89 AD .
Because of its strategic location astride the Silk Road , the Western Regions have been historically significant since at least the 3rd century BC .