Why the bratwurst (sausage) is so common in German?
And why every region have its own special type of sausage? 
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Already answered here.
anat, welcome to the Straight Dope Message Boards, we’re glad to have you with us.
WHen you post a question, once is enough: you’ve put the same question four times, in two different forums. That’s against our rules. Please read:
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Meanwhile, those who want to discuss, please go to: Bratwurst and I’m closing this one.