Collapse of empiresWhat were the cause for the collapse of the Roman Empire? How were these similar or different to the collapse of the Assyrian,...

The Roman
Empire was over-extended, and that's the main reason it collapsed.  It basically got too big. 
On the other hand, no matter how powerful you are there is always going to be someone else more
powerful looming, waiting for you to make a mistake so they can swoop in and pick up the
pieces.