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alternatehistory.com
I've been looking at this site for a few days now, and it looks really interesting so i'll give it a shot. Sorry if some things I write might be 'impossible', but hey, it's alternate history, right?
Anyways, what if Spain and Portugal - already allies of Nazi Germany - officially joined the Axis and invaded France. What would the consequences be? Would the US and britain make a landing in, say Lisbon? Would they liberate Madrid? Or would Spain and Portugal be ignored until they reach Berlin and the Allies merely wait for them to surrender?