Do now fill the blanks and type the complete sentences

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

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).

i would say it is the roman empire europe after the norman conquest.