The correct answer to this open question is the following.
Although there are no options attached or further references, we can comment on the following.
I think some of the challenges facing those restoring the Hagia Sophia church in Turkey are the following.
First, the budget needed to continually restorative the impressive building. Next, the qualified persons to do it. They need specialists in engineering and art to do the kind of conservation needed.
For a monumental structure like Haga Sophia, it is required to have a high budget to do permanent maintenance works as a preventive measure, as well as to correct the problems caused by the pass of time such as erosion, cracks in the walls, humidity.
The animal that changed their ways was the horse.
One of the main reason why more people didn't foresee the economic collapse of the 1930s is because it happened so quickly with no warning, since the US economy during the 1920s was incredibly strong and showed no signs of slowing.
End of <span>the Civil War to 1900</span>
