POD, the Haitian slave revolt was suppressed, so as a result instead of selling all of what in TL would be the Louisiana territory, Napoleon retains the Orleans Territory and portions that are in TL part of Louisiana and Arkansas, plus the Spanish session bits that came a bit earlier (those damn butterflies!). And sends more French colonists (i.e. people he'd rather not have in France due to questionable loyalties).
But history still happens and Napoleon falls, no wait he's back up! No wait he's defeated again. And meanwhile French Louisiana functions quite independent of France proper and decides that it would rather stay that way...
So how would Louisiana's independence come about? Would it be a Republic of a Monarchy (of some sort)? How would it stay out of the control of the United States? And most importantly of all, what comes afterward?