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Now I think about it, I realise that the chronology of when they migrated over the atlantic has to be matched to the chronology of when the various protestant sects split off from each other here in britain, which is totally beyond me, and not too much the sort of thing I want to study! I seem to recall that baptists split off from presbyterians here in britain, so some migrants would already have been baptists before migrating, this being -- uh -- early to mid nineteenth century, maybe? I could chase it all through wikipedia ... thank heavens for wikipedia, it is excellent on this sort of relatively uncontroversial stuff.