AHC/PC: Rhode Island's 1652 ban on slavery is enforced

TIL that Rhode Island banned slavery in 1652, restricting the term of service for both black and white indentured servants to ten years. However, the law was largely ignored - most slave owners didn't let their "servants" go at the end of the term, and no one made them - and eventually, in 1703, the colonial assembly passed another law making black slavery legal. Rhode Island ultimately had the largest slave population in the north - 10 percent of the population were slaves in the mid-18th century, and plantation slavery was practiced - and, like the other northern colonies, didn't return to abolition until after the revolution.

Is there a way to get the 1652 law to stick? The courts already recognized the standing of slaves to sue for their freedom, so a slave held beyond the ten-year term would have a chance of prevailing in a lawsuit against his master. OTOH, given the economic importance of slavery in Rhode Island, this tactic would probably work only a few times before the colonial legislature changed the law. Making Rhode Island free soil in the 17th century would most likely require a thumb on the scale from London, and that commitment didn't exist at the time.

Alternatively, would it be possible for any part of British North America to abolish slavery during the colonial era? There were several efforts in Massachusetts just prior to the revolution - in 1773 and 1774, in the wake of the Somerset judgment, groups of slaves and free black people petitioned the General Court to declare freedom throughout the colony - but both the General Court and the governor had other things on their mind at the time, and nothing came of the petitions. Might there have been a different result if a case equivalent to Somerset were decided earlier - in the early 1760s, maybe, when tensions between the colonies and London weren't as high and the General Court might take the judgment more seriously? Could there also be a chance of abolition elsewhere in upper New England at this time (New Hampshire seems the most likely candidate), and if so, what effect if any would this have on slavery after the revolution or on the revolution itself?
 
Alternatively, would it be possible for any part of British North America to abolish slavery during the colonial era?

One idea I had might be a major shift on the "supply side", more massive availability of white laborers for indentures and work for hire due to the Thirty Years War being a smack-down of the Protestant states, leading to a large German Protestant population getting involved in chain migration to the American colonies earlier than OTL and on a larger scale, see thread: Counter-reformation wildly successful in Holy Roman Empire.

If this German migration comes to massive proportions between 1648 and 1798, it could outcompete African slave trade on cost. Meanwhile, although it may be back-casting attitudes of some German sects at some times and places to others, if the Germans constitute an anti-slavery group it all could weaken the legal consolidation of slavery in Virginia, Maryland, Pennsylvania, and make the anti-slavery initial regulations in the Georgia colony stick.

Slavery might become a thing that is not considered vital for tobacco, just for Caribbean plantations and things that were a much smaller component of mainland colonial agriculture like rice, indigo, cotton. Maybe indentured and free labor could work for these too. The main crop for which indentured or free labor seems impractical is sugar, but sugar was not really a thing on the English mainland colonies.

Could there also be a chance of abolition elsewhere in upper New England at this time

Or possibly Pennsylvania, which I think had Quaker-based antislavery activism earlier in the 18th century than in many of the other colonies.
 
Might slavery last longer if it's less wide spread and less people are seen to suffer under it's yoke?

So less people suffering longer is that better than more people suffering for a shorter time.

Tipping the scales may be the fact the second one, OTL, only ends after a horrible civil war.
 
The best best, as you say, would be an earlier equivalent to the Somersett case. Since both England and Scotland had abolished slavery centuries earlier, there is a huge extent of time in which such a ruling could happen.
Maybe around 1600 some Spanish nobleman has a slave run away when visiting England, and sues to have him returned.

Then, when the Colonies are protesting their rights as 'Englishmen', some of the northern Colonies formally abolish slavery because English law prohibits it and they are playing up their Englishness.
 
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