Exiled After a Failed Showdown, I Returned with a Million Soldiers

[Alternate History] + [Infrastructure Building] + [Princes] + [Multiple Heroines] + [Grow Stronger by Killing Enemies] Reborn as the Ninth Prince of the Great Thousand Empire, Chen Guan only wanted to live as a carefree prince. But from the start, he was framed and exiled to a deadly frontier! “Host crisis detected! Territory bound successfully! The ‘Ruler of All Under Heaven’ System has activated!” The higher the people's approval in his territory, the stronger he becomes?! Then he'll develop it on a massive scale and push toward the industrial age! Reward: 《Eight Desolations Body-Shattering Astral Qi》! Every person he kills adds another strand of astral qi?! Then this young master will become the frontier's god of slaughter! And what about martial cultivation? Save your breath! First, take a swing at my spade! Fine, fine, so that's how we're playing it? You may be sitting on the throne, but it's not as if I, Chen Guan, can't claim it too! While everyone else was fighting for power, Chen Guan quietly set about building infrastructure. The northern frontier is windy? What of it! Irrigate with spirit liquid, reap bumper harvests, train powerful troops, build impregnable fortresses...