The fall of the Roman Republic was caused by multiple events. This included political infighting, which led to social instability. Citizen assemblies tore at the fabric of Senatorial power. Men like Marius and Sulla with rivalries weakened structure. People like Populares who looked for support in the lower class divided it into quarreling groups. Caesar continued a cycle of events that made collapse irreversible. The civil wars occurring after Caesar's assassination led to the need for a sole ruler. The adoption of Octavian and the exalted post of Augustus spelled the end for the republic.
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