Hope this helps :)
imperial crisis leads to civil war.
roman forces withdraw from britain as goths attack rome.
odoacer topples romulus augustus
huns attack the empire and drive german peoples ahead of them.
the factors that the economies of the muslim empires prosper were:
1- land trade routes-located between three continents
2- sea trade routes
trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.