The power not delegated to the US by the constitution, nor prohibited by it to the state are reserved to the States respectively, or to the people what government is this

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).