My Kingdom: Rise From Chaos

Lane Carter time-travels to the Qing Kingdom, which has just been conquered by Northern Barbarians' cavalry. He and many female refugees are imprisoned by the Northern Barbarians. At a critical moment, Lane awakens a nation-building system: as long as he increases the number of citizens, he can continuously obtain various magical system rewards. Therefore, Lane takes in many female refugees along the way, leads them to develop production, solve survival problems, trains an all-female army, repels various powerful enemies, and finally builds a powerful country of his own in the chaotic world.