After the cotton harvest, workers had to carefully separate the plant's sticky seeds from the cotton fibers. Eli Whitney solved this problem with his invention of the cotton gin in 1793. Whitney's gin quickly and easily removed seeds from cotton fibers. With a cotton gin, productivity - the amount a worker can produce in a given time - shot up. The cotton gin helped workers process 50 times more cotton each day than they could by hand.
The use of the cotton gin had important consequences. First, it encouraged farmers to grow more cotton in more places. Second, since Southern planters relied on enslaved workers to plant and pick their cotton, demand for slave labor increased and expanded west. Finally, the use of the cotton gin helps fuel textile production in Northern factories like the Lowell Mills.

Q: 6. How many more slaves are there in 1860 than in 1800?

5. How many more bales of cotton were produced in 1860 than in 1800?