What were the military economic political and social factors that lead to the fall of the Roman empire?

"margin-bottom:.0001pt;line-height:normal;">The term the fall of

Rome refers to the fall of the western part of the Roman Empire,

rather than the city itself, which was never conquered. This was a

process which took several decades. The process was determined by

several factors. It was precipitated by the invasions by the

Germanic peoples (the Vandals, the Sueves) and the Alans (who were

Iranian speakers) who invaded the empire and took over

north-western Africa and part of Spain, the Alemanni who took over

Switzerland and northwester France and the Burgundians who settled

in east France The loss of the agricultural rich territory in

Africa lead to a significant loss in revenue for the Roman

government. The Visigoths, another Germanic people, who had been

allowed to settle in the eastern part of the Roman Empire and then

moved to south-western France,took advantage of the situation to

take over Hispania (Spain and Portugal). The Romans lost political

unity. There were usurpations and infighting which made it

difficult to respond to the invasions effectively. There was also a

failure by the combined fleet of the western and eastern part of

the Roman Empire to dislodge the Vandals from Africa. It ended in

disaster and was very costly. The Romans army became reliant on

Germanic soldiers and two Germanic commanders-in chief of the Roman

army and installed puppet emperors (three by Ricimer, one by

Gundobad and one by Orestes.Amidst this political instability, the

reign of the last emperors was short.