After Being Blind for Three Years, Datang Reached the Bering Strait?

During the "Three Going to the Countryside" activity, Qin Ming accidentally fell off a cliff while trying to save a child in a mountain village, and happened to be rescued by Mr. Long. Qin Ming, who has awakened to the god-level teaching system, resolutely plans to continue teaching and help the children in this group of Houshan villages to get out of the mountains, get rid of poverty and become rich! From Chinese history to the industrial revolution, from modern medicine to the basics of physics, from economics to military theory, all kinds of unheard of doctrines are regarded as gods by Mr. Long! But Qin Ming didn't know that the people sitting in his school were not village children, but the princes of the Tang Dynasty! Even Mr. Long is Li Shimin, the emperor of the ages! "Didn't the Tang Dynasty begin to fall because of women? Poor Li Shimin spent his whole life beating barbarians, but in the end he was raped and ruined thousands of miles of country!" "How many times have I said that science and technology are the primary productive forces. Chengqian, what is the key to postpartum care for sows?" With Qin Ming's success in the classroom, the entire Tang Empire has undergone earth-shaking changes! Three years later, Qin Ming opened his eyes and looked at Datang who had reached the Bering Strait. He was instantly confused!