What was the environmental condition of northern europe around 9000 bce?

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.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.