WI:Slave Revolts in US results in Black Exodus

Have been reading this old TL, For Want for Wheel which revolves around Gabriel Prosser's Rebellion succeeding and all of the slave they recruit escape the US and enter Florida in a massive black exodus.
Is this in any way plausible, whether blacks are free or not, to create their own state within the Americas away from the United States. Keeping in mind Haiti
 
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