China's history had indeed gone through many empires and civilizations, including the Age of Desolation, the Age of Darkness, the Feudal Age, the Age of Castles, the Age of Emperors, and the Age of Firearms. The Barbaric Era refers to the primitive society, the Dark Age refers to the slave society, the feudal era refers to the feudal society, the castle era refers to the Warring States period, the imperial era refers to the Tang Dynasty, the firearms era refers to the Ming Dynasty. Each era had its own unique historical background and civilization characteristics, which made important contributions to the development of Chinese history.