Europe never had the unity it used to - the kind of unity China had because of geographic barriers, ethnic linguistic diversity, & shifting balances of power. Could not unite into Roman Empire. Rise to frequent wars, enhanced role of status of military men, and drove "gunpowder revolution."
The answer would be A. Retrieving
Answer:
Serfs
Explanation:
Slavery became increasingly uncommon through the Middle Ages replaced by serfdom by the 10th century
