Hyperinflation and mass economic instability led to fascism in Germany. Also, these economic factors also led to massive communist uprising in Germany as well, as citizens flocked to radical ideologies to cure their suffering.
However, Mussolini came to power years before the great depression. What drove the Italian people to him without significant material hardship? Also, were there communist uprising to counter the rise to power like there were in Germany and Spain?
I am very interested in the time-period.
/u/Klesk_vs_Xaero has previously answered:
What were the differences between National Socialism and Fascism?
What sort of resistance movement existed in Italy prior to their surrender in 1943?
/u/commiespaceinvader has previously answered:
What do the early stages of fascism look like, historically?
What is Fascism? What beliefs does it entail? (/u/restricteddata also)
Et cetera, et cetera. This question gets asked a lot, but more can always be said. I will link an answer below about Franco, since you mention him in your body text.