Which of the follwing inventions increased the necessity of slavery computer or cotton gin or electric light bulb?

The invention of the cotton gin in 1793 significantly increased the necessity of slavery in the United States. This machine revolutionized cotton processing, making it much faster and more efficient, which in turn heightened the demand for slave labor to cultivate and harvest cotton. While computers and electric light bulbs are impactful inventions, they did not directly influence the expansion of slavery like the cotton gin did.