British Republic
Banned
But not with Mexico. Annexing that takes decades, piece by piece. If the PODs are right they would keep it.
By the time they get involved in the War of Independence in New Spain (30+ years after the Bill of Rights), they are not going to be too many issues with Catholics or to a extent mixed-race Spanish Speaking Catholics.
Even if they do have a issue with extent mixed-race Spanish Speaking Catholics, "All of Mexico" is very likely to happen because the slavers are going to be more desperate than in OTL to maintain the balance of power.