Rebirth: I Have Unified This World!

I, Tang Tianhao, was kidnapped. I thought I was dead on the spot, but I accidentally traveled through time and became the prince of the Dadang Dynasty. You will find hell difficulty at the beginning, with clans dividing the country and enemies from outside looking at you! Wait, there seems to be a lot of other things in my mind. Let me take a look, damn! How to build an industrial system! Damn it! How to make guns and ammunition! Okay, okay, this is how you play, right? The First Emperor didn't know how big the world was, but I do!