Answer:
It's capital was moved to the Arabian peninsula
Answer: The Eiffel tower
Explanation: The Eiffel Tower was supposed to be torn down after 20 years. As mentioned before, the Tower was built with the intent of showing off France's industrial prowess during the World's Fair, but the plan was to tear it down after 20 years.
After the fall of the Western Roman Empire, Europe sank into a 700 year period of instability and then began a gradual recovery that led to the Renaissance.
What model are you talking about?