Poor Infrastructure Maniac

I traveled through time and became a fool from a poor family. My brother and sister-in-law kicked me out, just waiting for me to freeze to death in the cold winter. They still don't know what great things a fool like me can do that will shock the world! Others fight for hegemony by swords, but I rely on digging canals, building roads, and burning bricks to make iron. Others make money by plundering, but I rely on having factories all over the world and doing business all over the world. I teach the refugees how to read, give jobs to poor women, and make all poor families in this world useful to me! When the emperor and the vassal king were killed, both of them were injured, and when the torrent of steel that I built with my own hands rolled over the battlefield, Only then did the Supreme Being on the Dragon Throne realize that his biggest enemy was never other princes. But it's me, whom he never took seriously—the infrastructure maniac from a poor family!