I've been reading a very good book on Late Antiquity called The Fall of the Roman Empire: A New History of Rome and the Barbarians by Peter Heather. Heather claims that it was mainly 2 things, the rise of Sassanid Persia and the arrival of the Huns, that ultimately lead to the collapse of the Western Empire.
The need to counter the Sassanid threat stretched the Roman military machine to it's limit, the Roman economy was groaning under the strain. Things were fine as long as the Germans acted as the usually did (that is, the "normal" levels of raiding the Rhine-Danube limes could handle), but when the Huns arrived the Germans stopped acting like they usually did. What started as a relative "trickle" of refugees in 376 became a raging torrent by 407 as the Huns pushed westward, Rome's northern frontiers were simply overwhelmed, the Roman state could not hold off the Sassanids and the incoming waves of Germans at the same time.
The need to counter the Sassanid threat stretched the Roman military machine to it's limit, the Roman economy was groaning under the strain. Things were fine as long as the Germans acted as the usually did (that is, the "normal" levels of raiding the Rhine-Danube limes could handle), but when the Huns arrived the Germans stopped acting like they usually did. What started as a relative "trickle" of refugees in 376 became a raging torrent by 407 as the Huns pushed westward, Rome's northern frontiers were simply overwhelmed, the Roman state could not hold off the Sassanids and the incoming waves of Germans at the same time.
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