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Can anyone recommend any books in English discussing the various theories of why the Western Roman Empire fell?
Here's the reading list from my university's course on the Western Roman Empire:
BISPHAM, E. (ed.) (2008), Roman Europe. Oxford: OUP
MATTINGLY, D. 2001. An Imperial Possession: Britain in the Roman Empire. Penguin.
WELLS, C. 1992. The Roman Empire. Cambridge: Harvard University Press.
CARROLL, M. 2001. Romans, Celts and Germans. NPI Media Group.
CRAWFORD, M. 1992. The Roman Republic. London: Fontana.
HUSKINSON, J. 2000. Experiencing Rome: culture, identity and power in the Roman empire. London: Routledge
MILLAR, F. 1981. The Roman Empire and its Neighbours. London: Duckworth.
MORLEY, N. 2010. The Roman Empire: roots of imperialism. New York: Pluto Press.
SOUTHERN, P. 2001. The Roman Empire from Severus to Constantine. London: Routledge
WELLS, P.S. 1999. The Barbarians Speak. Princeton: PUP
WOOLF, G. 1998. Becoming Roman. Cambridge: C.U.P.
ALLASON-JONES, L. 2000. Roman Woman. London: Michael O’Mara.
ALSTON, R. 1998. Aspects of Roman History. London: Routledge.
Alföldy, G. (1985), The Social History of Rome.
Beard, M. and Crawford, M. (1999), Rome in the Late Republic.
CAMERON, A. 1993. The Later Roman Empire. London: Fontana.
CAMERON, A. 1993. The Mediterranean World in Late Antiquity AD 395–600. London: Routledge.
CUNLIFFE, B. 1988. Greeks, Romans and barbarians: spheres of interaction.London: Batsford
Fleming, R. 2011. Britain After Rome: The Fall and Rise 400 to 1070. Penguin.
Gardner, J.F. (1993), Being a Roman Citizen.
Garnsey, P., and Saller, R. (1987), The Roman Empire: Economy, Society and Culture.
Goodman, M. (1997), The Roman World 44 BC - AD 180.
Kamm, A. (1999), The Romans: An Introduction.
MATTINGLY, D. (ed.) 1997. Dialogues in Roman Imperialism: power, discourse and discrepant experience in the Roman empire. Portsmouth, RI: JRA Supplementary Series 23.
Nicolet, C. (1980), The World of the Citizen in Republican Rome.
Parkin, T.G. & Pomeroy, A. (2007), Roman Social History.
Salway, P. 2001. A History of Roman Britain. Oxford Paperbacks.
SCARRE, C. 1995. Chronicle of the Roman Emperors. London: Thames and Hudson.
Scullard, H. (1982), From the Gracchi to Nero.
Treggiari, S. (2002), Roman Social History.
 
A Distant Mirror: The Calamitous 14th Century by Barbara W. Tuchman

is a great, great, great read.