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Paragraph four of Anna Quindlen "Quilt of a country" is mainly constructed with questions, and repeats the words "What is the point" at the beginning of each question.
She is trying to prove her point, that despite all of the cultures and ethnicities and different backgrounds that constitute the American people, it is not enough to disintegrate the nation, while other countries were torn apart by these differences.
Answer:
In English grammar, the term sequence of tenses (SOT) refers to an agreement in tense between the verb phrase in a subordinate clause and the verb phrase in the main clause that accompanies it.
Hope this helps :)