Answer:
During the Middle Ages, the Catholic Church exerted enormous power over Europe. The Church influenced governments, waged wars and levied taxes. Although some actions, such as the Medieval Inquisition, are controversial today, the Catholic Church also established universities and hospitals, instigated positive social change and paved the way for economic growth.
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Before the 1800s, builders used cast iron. But they found that structural steel beams set in concrete allowed them to frame tall buildings that were more fire resistant and more structurally sound than cast iron. Since that time, steel has not only become the best building material for commercial construction but closely tied to economic health.
