@ Testhero: New Orleans is a candidate to become French again!
You would have to locate the city in the file (vanilla: line 1271) and change "CityOwner=2" to "CityOwner=3". The city would need to produce an "AMREV_UNIT_FRENCH_REGULAR" instead of a Spanish one (l.1275). You would have to do the same to the two units stationed there (a bit above in the file) and replace "UnitType=AMREV_UNIT_SPANISH_REGULAR, UnitOwner=2" by "UnitType=AMREV_UNIT_FRENCH_REGULAR, UnitOwner=3". Of course, make a copy of the original file and keep this one (whatever title) as an alternative scenario.
EDIT: dang! + line 1279, replace "Player2Culture=15" by "Player3Culture=15"!
Not quite historical since the city was ceded to the Spanish in 1763 at the end of the Seven Years' War (before returning briefly to the French in 1802-1803) but plausible anyway.
By the way, my intention so far is just to revive these scenarios through BtS, not adding new events at the moment (unlike the WWI). Although I did revive an event in AmRev that was not activated. Perhaps because it was not working as such and time was running to release Civ4!