What factors contributed to fall of the roman republic?

The Roman Republic fell mainly because of corruption, but other factors such as the split in the senate between the optimates ad the populares, the buying off of the tribunes by politicians and the bribery of officials all added to the fall. Military strongmen contributed, as during the republic the army swore their oaths of loyalty to their generals, not to their country. This enabled men such as Caesar and Sulla to march on Rome.