How can historical conditions be a reason to why some countries are rich and another are poor?

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.

attacks by the seljuk. a devastating blow to the entire byzantine world was dealt by christian crusaders from the west. the venetians were eager to destroy byzantine power and offered the crusaders money, ships, and part of the spoils of war.

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