A possible reason was the attacks on them by crusaders and mongols around the 11th and 12th centuries. Another reason could have been the Arab rulers removing taxes from non Muslims and doing other things that hurt there income.
Answer:A
the Incan civilization was known for the impressive waterworks in their city centers. Some of these included canals, fountains, drainage systems, and expansive irrigation.
One example of their advancement in this area is the Incan citadel called Machu Picchu which is said to be "the pinnacle of the architectural and engineering works of the Inca civilization" when talking about its water supply system.
According to its mandate, the TRC's aim was to look into the past “to provide the best possible foundation for moving into a future based on healing and hope.” Although city authorities declined to participate, the commission held public hearings, reviewed historical documents, and interviewed hundreds of people.
How did the US help in ww1?
The United States had 4,355,000 military personnel involved in World War I. The U.S. Navy played a major role in helping to blockade Germany, keeping out supplies, and hurting Germany economically. The U.S. forces that were sent to Europe during World War 1 were called the American Expeditionary Forces (AEF).
