Many immigrants left their homes and came to the united states in the 1800s because of

nativists tried to get rid of the immigrants as they thought they were going to ruin the u.s.  

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! : )