Kaiyuan was the title of Emperor Li Longji of the Tang Dynasty (AD 7 13-74 1). This period was the most prosperous period of feudal society in China. At this time, China is undoubtedly the largest power in the world, with open politics, developed economy and open mind. Obviously, this poem expresses the author's yearning for a powerful China.

But the last sentence "Andrew has thousands of buildings" is a bit neither fish nor fowl. This sentence comes from Du Fu's "The Hut is Blown by Autumn Wind", which means how to own thousands of big houses. You shouldn't say such things in your heyday. Because this poem was written after the An Shi Rebellion, the Tang Dynasty has begun to decline.