Turks spread the hegemony of Islamic political systems by adopting Muslim titles instead of other options available. This is seen in the eleventh and twelfth centuries when, “rulers began to claim the Muslim title of sultan”. This adoption of Islamic political systems in the area greatly influenced the religion that populated the region.
Another effect of the spread of Islam was an increase in trade. Unlike early Christianity, Muslims were not reluctant to engage in trade and profit; Muhammad himself was a merchant. As new areas were drawn into the orbit of Islamic civilization, the new religion provided merchants with a safe context for trade.
Self-Serving Bias is any time the perception of reality is distorted to aid in the creation or enhancement of self-esteem and the tendency to view oneself in a positive manner. This is the effect that Dre is illstrating.