Why did many civilians die during world war 1?
a. they faced disease and starvation
b. they died in battle
c. they were killed by poison gas
d. their homes were left in ruins from offensives

your answer will most likely be a.

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.