One of the major effects of the introduction and widespread usage of eli whitney's cotton gin was that
a) slavery was abolished in four southern states.
b) it led directly to passage of the fugitive slave act.
c) the demand for slaves grew to keep up with the increased production.
d) the demand for slaves dropped since the work could be done more efficiently.

Read the excerpt. this is an example of a strong conclusion because it summarizes why the author thinks joan of arc is a significant historical figure. leaves out evidence that was already proven in the body of the essay. adds information that was originally omitted in the body of the essay. summarizes everything the author has written without providing an opinion.