Connie,
Hippo is in Algeria, North Africa. A Synod was held at that time, not a Council. And the decision made in North Africa corresponds with the canon later accepted by the Church of Rome. I presume but do not know if Rome was invited to Hippo.
The power base of early Christianity lay in North Africa - Carthage and Alexandria in particular, with the Eastern Church having great influence (as per the Council of Nicea, where Rome was an observer only).
The 4th and 5th centuries saw the bloodiest conflicts between Christians, based solely on doctrinal differences (think of the current civil war among Muslim sects, but many times worse). These conflicts weakened the Christian Church's hold in North Africa, enabling the Muslims to take over, and Christianity moved northwards to Europe, and thus Christianity became a European religion, with its Middle Eastern origins taken over by European cultures.
Doug