Why was otto i the most effective ruler of medieval germany?

How did the crop lien system trap some farmers in a cycle of debt

What does the timeline above show about the consequences of the persian wars? a. each city-state of greece had equal influence after the wars. b. athens and sparta continued attacking persia after the wars had ended. c. persia continued to dominate greece for years after the wars. d. the alliance between athens and sparta ended shortly after the wars.

Why did china build the great wall of china?