The most effective organizational pattern for the speech is topical, where the central idea is divided into smaller subcategories.
The most effective organizational pattern for arranging the main points of a speech with the central idea "Estate taxes should be retained because they preserve opportunity for all, because their elimination would increase the national deficit, and because they are consistent with American values of fairness and justice" would be topical. In a topical pattern, the speaker breaks down the central idea into smaller subcategories.
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