Spain losing it's New World Empire and both of it's Naval Fleets
Decline of rural living, but sparked tremendous amounts of economic growth eventually. Early urbanization was filthy though, no proper sewage, overcrowded cities. So many people surged into these urban areas at one time, often not finding enough jobs for everyone.
I think it might be true i’m not sure
The Crusades is the series of wars between the two groups but if you're looking for a certain one I can further elaborate.
