According to Chauncey, why is marriage at the center of the debate over gay equality

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According to Chauncey, why is marriage at the center of the debate over gay equality

Gender and sexuality were central themes in the culture and politics of the late twentieth century, as witnessed by the battle of the Equal Rights Amendment and abortion. In fact, there might be no greater wedge dividing Americans than their attitudes about gender and sexuality. That is still true today, although the most debated issue relating to those themes is gay marriage. Our book for this assignment helps us understand the history behind today’s debate over gay equality.
Why Marriage?: The History Shaping the Debate over Gay Equality, by George Chauncey, investigates why and how this debate came to be. Your assignment is to answer the title question of the book:
According to Chauncey, why is marriage at the center of the debate over gay equality?

look at the attached file for instructions