Why do ethnic group own allergies?

I mean we all know that people hold allergies that respond to a certain thing. I'm allergic to pollen and cats. What is it in the body that make people allergic? What is it that when you breathe in pollen something clicks and says "sneeze and itch!"
Answers:    What make people allergic is a basically a weak immune system. But a "sneeze and itch" here and in that is normal. It's your body trying to get rid of something. Constant allergic reactions is a sign of a immune system specifically not 100%.
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