What were the Middle Ages? Why do some people refer to them as "The Dark Ages?"

Explanation:

The Dark Ages is usually referring to the first half of the Middle Ages from 500 to 1000 AD. This is why historians call this time the Dark Ages. Although the term Middle Ages covers the years between 500 and 1500 throughout the world, this timeline is based on events specifically in Europe during that time

the united states began searching for a way to reduce oil

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