Question

this highly diffused distribution of power is conventionally known as __________. but this vague term is unsatisfactory for several reasons. serfs feudalism vassels fiefs

Explanation:

Feudalism is a social and political system characterized by a decentralized distribution of power. Serfs were peasants bound to the land in feudal society. Vassals were those who held land (fiefs) from a lord in return for service. The question is about the system (not the people or the land - holding unit), so feudalism is the relevant term.

Answer:

feudalism