During which dynasty did construction on the main portion of the great wall of china begin?

List of social classes of the shang dynasty in order ?

The 20th amendment, also called the lame duck amendment, decreased the amount of time between the presidential election and the inaugration of the new president. what are the advancements that allowed for this amendment?

Which is not characteristic of capitalism? a) market e-commerce b) supply and demand c) freedom of competition d) a society without social classes