Let's say Algeria is successfully integrated into France. The Algerians receive full rights as French citizens and thus Algeria becomes independent. I'm not sure when the best PoD for this would be (post-1900, pre-1900, I'm not sure) but let's more or less hold the rest of OTL History until ~1950 constnat. France retains Algeria. France opts to keep Fezzan after WWII. France also keeps Gabon, whose leaders wanted to remain French OTL, and French Congo. Assuming maybe 20% of Libya's oil is in Fezzan (I'm really not sure), this would mean France probably puts out, then France would probably be #12 in the world in terms of oil output. With all this oil wealth, France invests more in providing healthcare, economic development, and family planning in its overseas provinces. Odds are Algeria, Fezzan, Gabon, and Congo together have a population of 40 million or so. France altogether will thus have ~110million people. Would a France with a larger population and lots of oil be able to qualify as a Superpower?