How did the Roman Republic become a dictatorship?

General Sulla was declared leader after a long civil war.
The patricians and senators were defeated by General Sulla.
General Sulla challenged and defeated his opponent in an election.
The plebeians supported General Sulla’s overthrow of the government.

General Sulla was declared leader after a long civil war.

Explanation:

Civil War:

Marius led an army for the plebians.

vs.

Sulla led an army for the patricians and senators.

then...

Sulla won and was dictator.

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definitely a for sure. ill see and update if i get the answer