It would be difficult for a fellow facist dictator to stay on the sidelines but lets go with the what if.

Italy would be an unknown thorn on the side for the allies. It would also allow the British to free up ships to fight the wolfpack threat. It would also allow them to build up their army and prepare for an invasion of the continent. The raid on Nazarie would have been larger and perhaps an actual attempt at getting a foothold on the continent.

The American contribuition would have been about the same but the British would have a larger role having more men to contribute.

Question is, how successful would an invasion in 42/43 be?

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American by birth, TEXAN by the grace of GOD!