The fall of the roman empire decentralized europe, their strong government was replaced with loose knit kings and princes. The armys were weaker, trade and education collapsed aswell plunging europe into the dark ages.
Answer: D
It allowed sailors to know their direction.
Explanation: its obviously not any of the others and compasses tell direction
The iron curtain was like a curtain. It separated parts of Europe and was hard to escape the communism.
