A cotton grid is a machine that quickly separates cotton fibers from there seeds. The negative impact was that the rate of slaves increased and the number of slave states increased as well. Interchangeable parts are parts inside of a product that can be replaced piece by piece, without having to replace the entire product. Assembly line is when you have all the workers rounded up in a row, and they all repeatedly do the same job the entire time. The purpose of this was to save time.
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