Point of divergence moments before or right after the end of the second world war.
The challenge is to have a plausible chain of events where, roughly speaking, 2022 France is holding bilateral talks with the US over its military posturing towards- and destabilization of other European countries (and potentially Algeria, still?) which it wants to claim as its "natural borders" or "rightful zone of influence", putting everyone on edge, especially because this France also has nukes.
The challenge is to have a plausible chain of events where, roughly speaking, 2022 France is holding bilateral talks with the US over its military posturing towards- and destabilization of other European countries (and potentially Algeria, still?) which it wants to claim as its "natural borders" or "rightful zone of influence", putting everyone on edge, especially because this France also has nukes.