Abraham Lincoln’s speech, the Gettysburg Address, is considered as the most influential speech in the history of the United States. In the era where leaders commonly delivered a long speech for about two hours or more, Lincoln speech provided a different path of an effective speech: less than three minutes and not more that 300 words.
it is simply because he used a lot of parallel structures-repetition of grammatical pattern to convey similar ideas. Let see closer how this speech is constructed in term of parallel structures.
