1) why did the ussr and the us enter a period of detente? explain clearly and whoever explains the best will be awarded and marked as the brainliest

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).