Yes. There is a much higher rate of peanut allergy in the USA as opposed to Israel which almost has a zero peanut allergy.
Our allergist is a well-known peanut allergy specialist. She has mentioned in her lectures that Israel starts daily peanut exposure in babies mouths at birth and they essentially have zero peanut allergy in Israel. You can google it.
Here’s a link which explains some of it.
Yes, I’ve read research that has found that children who are given peanuts in their first year (as early as 6 mos) have much less likelihood of developing a peanut allergy.