Which practice in the catholic church caused a rift between the papacy and the holy roman emperor?
a) changing the rules for appointments of church officers
b) forbidding catholic priests to marry
c) making latin the official language of the church

a) changing the rules for appointments of Church officers

Explanation: Because the Investiture Controversy was the most significant conflict between secular and religious powers in the medieval Europe. It began as a dispute in the 11th century between the Holy Roman Emperor Henry IV, and the Gregorian concerning who would control appointments of church officials .

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.