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I'm planning on writing a TL which includes an initial POD during the ACW that leads to the CSA gaining independence and the 2nd Mexican Empire remaining intact. Due to this I have been wondering what butterflies could effect the Franco-Prussian war. Also I plan on having the American ordinance engineer Benjamin B. Hotchkiss move to France as he did in OTL and have him invent his HotchkissRevolving Cannonbefore the Franco-Prussian war of TTL starts so that it can be used by the French.
Some say that an intact 2nd Mex Empire would butterfly away the war but others are not convinced so I'm going to go with that.
So if both countries existed by the Franco-Prussian war would they offer France troops and would France accept? Also if France did have access to a larger number of troops provided by the CSA and Mexico, as well as the Revolving Cannon in their artillary, how might the defence of France be different?