Why was Pope Leo III’s crowning of Charlemagne significant? It established the Church as a political force.
It proved that the Church could make political decisions.
It indicated that the pope had more power than monarchs.
It showed that the pope was ruling the Holy Roman Empire.

Ithink it's d. i was not born in 1800's. sorry if i am wrong but i think it's d

Agreat cause of former hostility was caused when the invasion of north europe was invaded by germany and when the devestation of pearl harbor have occurred during world war ii followed by the axis powers; because of the damage created by the axis powers, both nations in europe and the united states grew hostile and grew further alliances with more  nations in europe to work along side together to oppose the axis powers.