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The Spanish government recently announced an official fast-track path tocitizenship for any individual who is Jewish and whose ancestors were expelledfrom Spain during the inquisition-related dislocation of Spanish Jews in 1492.It would seem that this policy targets a small subset of the global Jewishpopulation, i.e., restricted to individuals who retain cultural practicesassociated with ancestral origins in Spain. However, the central contributionof this manuscript is to demonstrate how and why the policy is far more likelyto apply to a very large fraction (i.e., the vast majority) of Jews. This claimis supported using a series of genealogical models that include transmissable"identities" and preferential intra-group mating. Model analysis reveals thateven when intra-group mating is strong and even if only a small subset of apresent-day population retains cultural practices typically associated withthat of an ancestral group, it is highly likely that nearly all members of thatpopulation have direct geneaological links to that ancestral group, givensufficient number of generations have elapsed. The basis for this conclusion isthat not having a link to an ancestral group must be a property of all of anindividual's ancestors, the probability of which declines (nearly)superexponentially with each successive generation. These findings highlightunexpected incongruities induced by genealogical dynamics between present-dayand ancestral identities.

Let my people go (home) to Spain: a genealogical model of Jewish identities since 1492