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Just a question I had earlier when I was contemplating a few maps. What would be the largest possible Metropole that France could extend to current day? I'm not asking about the largest possible French Empire (either colonial or continental), but merely the largest swath of land that France could integrate into the mainland and have it be part of the French nation assuming closest to OTL conditions.

In other words, which parts of the French (colonial) Empire as it existed could France have kept? I'm thinking portions of Algeria and Gabon off the top of my head, but I'm not sure if there are any others. Perhaps Haiti as well. The second part would be which parts could France have required which were possible OTL. Here I'm thinking of Saarland and Wallonia off the top of my head, as well as Vanuatu, but I'm not too sure on any others.

There is no real set PoD, either. I'm just curious as to whether there were any other former colonies/other territories that almost became French save for the ones I can think of.
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