Invasion of Italy by Allied forces led to the downfall of Mussolini's fascist regime in Italy. This event marked a significant turning point in World War II and had a profound impact on the political landscape of Italy.

Background:
- Mussolini came to power in Italy in 1922, establishing a fascist regime.
- He aimed to create a totalitarian state, suppressing political opposition and implementing policies that emphasized nationalism, militarism, and autocracy.
- Mussolini aligned Italy with Nazi Germany and Japan, forming the Axis powers during World War II.

Invasion by Allied Forces:
- As World War II progressed, the Allied forces, made up of countries opposing the Axis powers, gained momentum in their campaigns across Europe.
- The invasion of Italy by the Allies began in July 1943 with the invasion of Sicily.
- The Italian government, under pressure from within and outside the country, had grown increasingly dissatisfied with Mussolini's leadership and his alliance with Germany.
- In July 1943, the Fascist Grand Council voted to remove Mussolini from power and placed him under arrest.
- The new Italian government, led by Marshal Pietro Badoglio, sought to negotiate with the Allies for a separate peace.

Impact and Outcome:
- While negotiations were ongoing, Mussolini was rescued by German forces in September 1943 and established a puppet state in Northern Italy known as the Italian Social Republic.
- However, the Allied invasion of Italy continued, with the objective of liberating the entire country from fascist control.
- By April 1945, the Allies, consisting of American, British, Canadian, and French forces, had effectively defeated the remaining Axis forces in Italy.
- Mussolini was captured by Italian partisans on April 27, 1945, while attempting to flee the country.
- He was executed the next day, marking the definitive end of his regime.

Significance:
- The invasion of Italy by Allied forces played a crucial role in the downfall of Mussolini's fascist regime.
- It weakened the Italian government's support for the dictator and provided an opportunity for those opposing fascism to rise up.
- The event also marked the end of Italy's involvement in World War II as an Axis power, shifting its allegiance to the Allies and paving the way for a new democratic government in Italy.