Transmigrating to the Zhenguan Era, I Get a Mutant Red Alert System from the Start

I transmigrate to the seventeenth year of Zhenguan and become Li Chengqian, the deposed crown prince accused of treason! The court officials kick me while I'm down, and Li Shimin is suspicious and coldhearted. If I'm going to die anyway, I might as well overthrow the Tang Dynasty! I activate the Red Alert System and fight my way out of Chang'an with the beginner's gift pack. I bring troops to Xuanwu Gate a second time, train my cannons on Emperor Taizong and force him to abdicate. Once I ascend the throne, I unlock the World War II tech tree! I wipe out the aristocratic clans that have ruled for a thousand years, redistribute the land, and open schools across the realm, creating a golden age for all. Missiles bring Europe and Asia to heel, nuclear warships command the four seas, and I unify the Blue Star. Unlocking nuclear fusion, I venture into space and colonize the solar system. My warp-drive battleships crush alien civilizations as I wage war across the endless stars, rising from a prisoner of the Tang Dynasty to the eternal emperor of the universe!