The Zhou conquered the Shang around 1020BCE claiming the Mandate of Heaven.
The Social Structure during the Zhou Dynasty was:
Innovations included building roads to connect China, the elaboration of picture writing begun by the Shang, a system which is an ancestor of modern Chinese writing. Iron ploughs, irrigation systems and flood control systems were also created.
After a political defeat in 771 BCE power became increasingly decentralized as the power of local Lords grew. Until the 200s BCE regional Lords were involved in small wars which eventually led to the downfall of the Zhou.