Explain the circumstances surrounding the fall of the Roman Empire and its primary causes

What will be an ideal response?

Why and how the mighty Roman Empire came to collapse in the fifth century is unknown. A great many theories have been advanced, ranging from soil exhaustion and lead poisoning to the malaria epidemic of the third century, and the absence of a system for legitimate succession to the throne. In reality, it is likely that no one problem was responsible. Rome's slow decline was probably the result of a combination of internal circumstances: the difficulties of governing so huge an empire, the decline of the slave trade, and the increasing gap between the rich and the poor—during the Pax Romana, one-third to one-half of Rome's urban population received some form of public welfare. The Empire's internal problems were made all the worse by repeated barbarian attacks on Rome's borders. In 476, a Germanic army commander led a successful attack on Rome and deposed the reigning Roman emperor, Romulus Augustulus, finally bringing to an end the era of the Roman Empire.