The Dual-World Gate: I Join My Dad in Raising a Rebellion

I transmigrate through a door to ancient times and become the heir of the Northern Wastelands. Each trip lets me bring three kilograms of modern goods with me. That bastard emperor keeps an eye on the Northern Wastelands, wishing my whole family dead. Rebellion isn't my intention, but it's inevitable. Anyone who stands in my way will become a corpse beneath my feet. To repel foreign threats, first secure the home front. I use a drone and a powerful flashlight to impersonate the Heavenly Eye, loudly proclaiming that I'm a disciple of the immortals as I hunt down enemy agents in the army. I build a city that never sleeps, make money, forge connections, and raise an army to rebel. With blueprints in hand, I develop technology and crush the ancient locals. In the end, I unify the realm. This ancient world may never have appeared in the history books. So why, after I become emperor, does the modern world unearth my artifacts and research my history?