What did Ghana rulers not adopt from the African traders?

battle of survival between farmers and the rabbits during the great depression

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.