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I think that argumentative writing is writing passionately about something you care about. It doensn't necessarily have to be an arguement. Its a process of establishing your position on an issue and backing it up with evidence. You want to pursuade your reader that something exists, or convince them that one thing may have made another thing happen or to get your reader out of his/her seat and do something about it! No matter what your argument may be, you always have to have evidence/proof/facts to back it up. It may not change your readers mind in how they think, but you want your voice to be heard!