Over time, historians have changed the ways they study the past because they have to

Historians are changing their approach toward history because history is not just about dates and historical events. All the events are related to the culture of the society and there are many political and economic factors for an it. Studying past and to get the true answers about the past events one needs to look into these matters also. So they changed their approach and all these factors are taken into consideration.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

8 years 100% positive

explanation: