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First Step
He gained support from the King of Italy and many landowners/factory owners & upper class people by using his blackshirt militias to put an end to socialist strikes. -
Second Step
Which then resulted in the King appointing Mussolini as Prime Minister. It was after this that his supporters marched on Rome as a victory parade/show of force. -
Third Step
He gradually transferred more powers to himself, until he could oust non fascists from the cabinet and could eventually name himself Duce.