I think they might have been invaded from the north by germany in trying to get Italy to join. However, the North Africa invasions might not have happened, and if the Allies or Axis tried to invade North Africa (which they wouldn't) they might join the war in order to protect their colonies. However, I think everything would have played out the same because usually, unless we are talking Hetalia, it seems that we forget that Italy was part of the war; we usually on focus on Germany and the extermination of the Jews, and the Japanese bombing Pearl Harbor. With Italy, they are usually left in the dark due to the fact it seems that they didn't do much besides re-enforcements and invasion of North Africa.