And ain't i a woman?
i could work as much
and eat as much as a man--
when i could get to it--
and bear the lash as well
and ain't i a woman?

what is the main purpose of the use of repetition in these lines?

it forces the audience to examine their ideas about african american women.
it shocks the audience by describing the treatment african american slaves.
it reassures the audience that the speaker has experienced the things she describes.
it shows the audience that the speaker is a supporter of popular social causes of the time.

i think the answer is restaurants offering only dinner

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.