Answer:
-Charlemagne united most of Western Europe for the first time since the Roman Empire. ...
-Charlemagne was the first emperor of the Holy Roman Empire. ...
- Charlemagne played a vital role in the spread of Christianity across Europe.
Explanation:
The answer is A. Three Gorges Dam.
Answer 'A' correctly describes the Great Wall = It was built to protect Qin's empire from foreign invasion.
Apart from defense, the Great Wall included border controls, and regulation of goods. After Qin dynasty, other dynasties had used it, to maintain their territories.
When people are united by common history and culture, they belong to a "nation" although this is not technically the case. Many people from different backgrounds and cultures can be part of a nation.
