The main political unit that emerged in the world is A. the state. A state is defined as a territory or land in which a defined number of constituents is ruled over a governing body that follows and implements a system without following necessarily a superior power. I think this is powerful enough.
After that, Liu Bang established the Han Dynasty.
Answer:
D.The election of the president by popular vote since it is supported by the populist party.
It was to shorten travel and trade distance.
