By alluding to Whitman’s poem in "I, Too, Sing America" Hughes was able to
a. draw connections to US cultural heritage.
b. criticize other African American poets.
c. become the leader of the Harlem Renaissance.
d. write about the US in a totally new way.

well stockyards mean a large yard containing pens and sheds, typically adjacent to a slaughterhouse, in which livestock is kept and sorted. and i'm assuming that by party you   mean a large group of people which does make sense because chicago is a very crowded place much like new york. stockyards tend to take up a lot of room due to needing the area for pens to keep animals in and the fact that stockyards are usually right by slaughterhouse where they process and distribute the product. so its much like a zoo but with some dead animal products close by.