What were some of the difficulties america faced in mainting good relations with jpan

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).

b. shared language, culture, and ethnicity

during the early years of world war i, the germans used "the submarine" to a great advantage