Interesting idea. Might lead to England becoming more technologically advanced.
Don't know if I buy into it, but there's a hypothesis that Jews bred themselves smarter and Christians bred themselves dumber. Literate Rabbis were considered good marriage partners, and the community helped support them if they ended up with lots of children. Clever Christians, younger sons who would not inherit much were forced to become celibate monks. And any girl who was smart but had few prospects for marriage would often become a nun. Thus Christians bred out smartness.
And Jewish communities often invested in skills and training, rather than land and property. They never knew when the next progrom would take their property away. Skill and craft cannot be stolen.
An England with more Jews living more stable lives might have many advantages. Practical denim pants. Reliable flintlocks when everyone else is stuck with matchlocks. Perhaps even an earlier discovery of how cholera is spread.
"Bred to be smarter"? Sorry, I'm not with you. Nobody bred themselves into anything. Most jobs in the Medieval period were hereditary. And alternatively, there were apprenticeships. Social mobility was restricted for many. Jews were the among the few people in Christian Europe who permitted to engage in usuary, and this became another family trade as well. Jews aren't smarter, they were just raised in the professions of their fathers. Its no use trying to reinforce a stereotype.
As for Christian aristocracies, older sons would almost always inherit the estate, no matter how intelligent they were. Some younger sons that were sent to the church, not for their intellects, but because few nobles wanted to divide their estates.
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