God-Level Naughty Boy of the Tang Dynasty

The otaku of the 21st century traveled through the Tang Dynasty and became the nine-year-old prince Li Shimin left behind. The God-given system builds factories and industries, including sweet potatoes, potatoes, chemical fertilizers, and pesticides to increase rice yields per mu. Destroy the Turks, defeat the Xiongnu, conquer Goryeo, conquer Japan, and establish the prosperous Tang Dynasty, which will be admired by the whole world!