Which of the following occurred after allied forces invaded the italian mainland in september 1943

After Allied forces invaded the Italian mainland in September 1943, the Italian Campaign started, in which Italy was defeated and Germany was left alone in the Western Front.

Explanation:

The Italian Campaign during World War II was a series of Allied operations in Italy from 1943 until the end of the 1945 European War. The Allies decided to start a campaign to regain the Mediterranean and planned to begin with the invasion of Sicily and then invade southern Italy. The campaign in Italy ended only in May 1945 with the surrender of the German Army.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )