Here is how the historian Dr. Ludwig Pastor explains it in his 1899 The History of the Popes vol. 5 pp. 345-7:
The Jews in Spain were a source of considerable trouble to Innocent VIII. They had become a real danger to the population by their usury and their proselytising. In 1484, the Pope took measures to counteract the evil; and in the following year he ...
Were Jews cut off from the Babylonian Geonim?
The Islamic Schism was a secondary reason for the waning influence of the Babylonian Geonim. The primary reason was economic, and is tied to the decline and troubles incurred by the city of Baghdad itself.
History of Baghdad
Baghdad's early meteoric growth slowed due to troubles within the ...