Final answer:
Trade and military conquest were the two factors that contributed to the growth of the Kanem-Bornu Empire.
Step-by-step explanation:
The two factors that contributed to the growth of the Kanem-Bornu Empire were trade and military conquest. The empire was able to maintain control over the slave trade through military innovations, such as importing weapons from North Africa. Additionally, the empire established strong relations with the Ottoman Empire and gained access to Turkish mercenaries and advisors, which helped strengthen their military.