The medieval Church was a unifying force in Europe after the fall of Rome because it offered

You mean the Catholic Church, it offered protection and the path to a better place when you died, that is why it had so much power. It said if you have faith then nothing bad could happen, furthermore, when the black plague hit, the Catholic Church as powerless towards the death, and so it lost many followers. *haughty sniff*

Explanation:

mass production/ assembly line production

this is false

richard nixon was the 37th president of the united state and didn't serve as a vice president for any president before him