One reason the crusades failed to conquer the holy land permanently was because

well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;