A monarchy can rule until death, resigning, or being overthrown. Most are in the same bloodline for generations. An example would be the Tudors started with King Henry VII and ended with his granddaughter Elizabeth I. So this reign was only 3 generations.
They captured Ethiopia to expand the Italian economy
<span>Delivering water to dry areas for growing crops</span>
I believe the answer would have to be Prejudice.
European,African and indigenous combination