Instead many historians point to a number of different problems combined that brought about the fall of the Roman Empire. There were 3 main reasons for the fall of Rome which are: political instability, economic and social problems, and finally a weakening of the frontier or border. The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders. The West was severely shaken in 410, when the city of Rome was sacked by the Visigoths, a wandering nation of Germanic peoples from the northeast. The fall of Rome was completed in 476, when the German chieftain Odoacer deposed the last Roman emperor of the West, Romulus Augustulus. In conclusion, the Roman empire fell for many reasons, but the 5 main ones were invasions by Barbarian tribes, Economic troubles, and overreliance on slave labor, Overexpansion and Military Spending, and Government corruption and political instability.