the collapse of the han dynastyThe han dynasty hadseveral reasons for its collapse. They had government corruption, peasant rebellion, and they had lords holding power instead of government.
the Visigoths and the fall of RomeThe Visigoth led by Alaric sacks Rome. They breached the walls and looted, burned, and pillaged through the city. `
collapse of the Gupta empire, under attackThe last great king of the Gupta was Skanda Gupta was ascended the throne about 455 A.D. Even during the later years of Kumar Gupta's reign, the empire was attacked by a tribe called Pushyamitra but it was repulsed, And immediately after the accession of Skanda Gupta, Hunas made inroads, but they too were repelled.
fall of rome due to splitting it in twoThe ancient Romans tried to solve some of their problems by splitting the Roman Empire in half, hoping that would make the empire easier to manage. Each side had an emperor, but the emperor in charge was the emperor of the western half, the half that included the city of Rome.
The huns invaded the guptasthe huns invaded the guptas in the north and the fighting them off drained the treasury leading to future problems and the empire collapsed.