Which of these is NOT true about Franklin Delano Roosevelt? O He was the president during WWII until his death,
O He was against adding more justices to the Supreme Court
O He helped end the Great Depression
O He helped create social security

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).