The war on terror is a war fought in the <em>mind. </em>Terrorist ideologies are held in the minds of individuals willing to carry out attacks on any given target with the intent of spreading fear and a message. The war in Vietnam may have been to combat communism, but we left after a certain while. We weren't contentiously attacked by Viet Cong after pulling out of the area, like we are by terrorists. The war on terror is a war that will <em>never </em>end, as the war's main "general" is in the mind, and you cannot wage war on the thoughts of individuals.
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Introductory Paragraph. See, first, Writing Introductory Paragraphs for different ways of getting your reader involved in your essay. The introductory paragraph should also include the thesis statement, a kind of mini-outline for the paper: it tells the reader what the essay is about.