Answer:
The answer to the question: How did Benito Mussolini become Prime Minister of Italy?, would be: He was appointed as such by King Victor Emmanuel III of Italy in response to the March on Rome, which took place in October of 1922.
Step-by-step explanation:
Benito Mussolini was probably one of the first Fascists of renown in Europe. It was he who initiated Fascism in Italy once he had renounced his participation in the Socialist Party in Italy. Through the March on Rome in 1922, Mussolini and his followers managed to come into power and defeat the then established Prime Minister Luigi Facta. Mussolini and his movement of Fascists were ratified in power by the King.