My Sui and Tang Ancestors Help Me Build an Empire

No System + political intrigue + alternate history + farming and conquest + technological boom In 522 AD, on the eve of the Six Garrisons Rebellion. The court is corrupt. The empress dowager, the child emperor, and powerful members of the imperial clan scheme against one another without end. Local magnates seize land, leaving the poor with nowhere to plant a foot. Gao Zhan, a modern man, transmigrates to Wuchuan and becomes a destitute horse trader. He crushes corrupt gentry, recruits horse bandits, builds an impregnable city, and keeps the common people safe. He recruits Li Hu, defeats the Rouran, and establishes his power in the northwest, waiting for the realm to descend into chaos. The centuries-long age of chaos between the northern peoples and the Han should end ahead of time.