John C. Calhoun used the concept of _[blank] in his arguments against the federal government interfering
with the practice of slavery in the South.

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).

i'm asking the same thing i asked this other cat all of

b is correct

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