Did the invention of the cotton gin lead to the civil war?

Hmmmm .......

Sort of, but it is a tough argument to make.
Perhaps because the cotton gin made a vast spread of cotton plantations possible and therefore made slavery a bigger factor in the economy of the United States than it would have been otherwise, it was a contributing factor to the friction between the slavery dependent states and the states which ran industries manned by free labor.
http://www.civilwar.org/resources/civil-war-history-how-the.html

Thank You.

You are welcome.

The invention of the cotton gin did not directly lead to the Civil War, but it had a significant impact on the political and economic tensions that ultimately contributed to the outbreak of the Civil War in the United States.

The cotton gin was invented by Eli Whitney in 1793, and its purpose was to separate the seeds from cotton fibers quickly and efficiently. This invention revolutionized the cotton industry by greatly increasing the speed of cotton processing. Prior to the cotton gin, cotton fibers had to be separated from the seeds manually, which was a labor-intensive and time-consuming process.

With the cotton gin, the production of cotton became much more profitable and efficient, which led to a significant increase in cotton farming in the southern states of the United States. This increased production created a massive demand for labor, leading to an expansion of slavery to meet the growing labor needs of cotton plantations.

As the cotton industry grew, so did the economic dependence of the southern states on cotton production and slavery. The mechanization of cotton production reinforced the institution of slavery, as plantation owners relied heavily on enslaved labor to cultivate and harvest cotton. This economic dependence on slavery created a deep divide between the northern and southern states, with the southern states fearing that any interference with slavery could harm their economy and way of life.

The disagreements over the expansion of slavery into new territories, along with other political and economic tensions, eventually escalated into the Civil War in 1861. So, while the invention of the cotton gin itself did not directly cause the Civil War, it played a significant role in shaping the economic and social conditions that led to the conflict.