What made the feudal system an effective system for controlling society

Feudalism was a very simple system, the most dominant and effective during medieval times. The feudal system was considered to be the most effective for the time because, under this system, the king had complete control and the guarantee of greater security. This system helped to build the structure of society around relationships that allowed vassals to have a piece of land in exchange for military protection and loyalty given to the king and lords.

the main reason the us senate rejected the treaty of versailles was because "european nations wanted to punish germany"

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me and mark as brainliest.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.