Name and describe one cause of the fall of rome

Invasion by Barbarian tribes was one cause. They had tangled with these groups for a while, but by the 300's the groups had gotten beyond the Empire's border. In 410 the Visigoth King Alaric sacked the city of Rome. The Empire was in constant threat until the Germanic leader Odoacer staged a revolt and removed the Emperor Romulus Augustulus. The empire never recovered.