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It can’t be so. All wizards are English and have a posh accent. This can be proven by the part where Hermione is lecturing her friends about how “it’s levioh-sah not leviosah”. What she is really getting at, is that if you have an accent, or English isn’t your first language, the spells will not work.
the irish kid constantly explodes because his accent screws with wizard voice commands
remember that post about Europeans trying to create more diversity by just calling things different arbitrarily?