The document discusses slavery in the United States between 1800-1850. It notes that slavery was already present in the 1700s but increased dramatically in the late 18th century. The invention of the cotton gin in 1793 made cotton farming highly profitable and increased demand for slave labor. Over 1 million slaves were transported from older slave states to new states in the South to work on cotton plantations. This led to debates between abolitionists who opposed slavery and slave owners who argued slaves benefited from being cared for. The tensions ultimately led to the Civil War.