Which political theory has been interpreted to mean that a president can shield critical information from Congress as a result of the separation of powers?

what the first or next guy says

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).

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.

the answer i chose to believe is 'harmony'