“i said so” – the reason many states (and many Christian countries) restrict marriage between cousins has to do with the way in which canon law (the law of the Roman Catholic Church) was assimilated into the local legal system. Canon law restricts marriage of cousins, which is why many states/countries do. It has nothing to do with genetics (there are situtations where cousins are at a high risk for genetic disorders if they marry, but the law on the books dates to well before genetics were discovered).
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