Hello,
Mexico, Mexico...
There is a bug in the /ACW/Events/Foreign Entry.sct :
3 French reinforcements events don't work because it have for condition an event which don't exist : "evt_nam_CSA_FrenchExpeditionMexico1862".
To solve it, search in the file the 3 lines with this "evt_nam_CSA_FrenchExpeditionMexico1862" and replace this with "evt_nam_CSA_FrenchExpeditionMexico1862Next"
Maybe it's still possible to jump it in the train of the 1.16 patch ?