Answer: D) Companies replaced hand-operated brakes with air brakes on trains.
Answer:
The Crusades
With the Seijuk Turks of central Asia bearing down on Constantinople, Emperor Alexius I turned to the West for help, resulting in the declaration of “holy war” by Pope Urban II at Clermont, France, that began the First Crusade
<span>Doctrinally, the split between the division of Christianity had to do with the nature of the deity. As a matter of historical causation, however, it is difficult to overlook the fact that the split in Christianity mirrored the concomitant division of the Roman Empire into Eastern and Western halves. As the halves of the empire grew further apart militarily and economically, so too did they grow further apart culturally and religiously.</span>
