<span>Assuming that this is referring to the same list of options that was posted before with this question, the best option is "exercise" since it can clear the mind. </span>
4. Cotton Gin harvested cotton
5. Because the cotton gin could harvest so much more, cotton farmers would buy and work more slaves for more profit.
6. A few major ones were immigration, making railroads, and using tariffs to ward foreign countries away from competing with the American market.
7. Industrial Revolution, I think the answer they want you to give is being blocked off from trading with England and France.
