The Yin-Yang(black-bright) dialectic holds that and specific phenomenon has two mutually contradictory yet complementary and convertible aspects (e.g., Canada is a relatively weak nation in terms of its human resources but an extremely strong country in terms of its per capita natural resources). Please use this dialectic theory to discuss both positive and negative impacts of political centralization and division on socioeconomic, political and cultural developments in China between 770 B.C and A.D 907. ( from Eastern Zhou to Sui-Tang Empires)
