President Carter’s foreign policy failures included not being able to bring Egypt and Israel together.

not being able to bring home the Iranian hostages.

not being able to promote détente with China.

not bringing the Shah of Iran to the United States.

lying without the limits of the several states; and may permit them, at such times, and in such manner as it

i think it was   tsar alexander ii

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).