The following brief film explains the need for and impact of the cotton gin from the 1780s to the 1860s.
This second brief film is a useful look at the cotton gin itself. But . . . .
Notice the background music; it suggests the lack of concern for mid-twentieth century black field workers and disregard for antebellum slaves. The reference to “pioneer families” being the ones who got the seeds out of cotton also reveals that disregard. The suggestion is a Gone with the Wind image of happy slaves suited only for servile work.
https://www.youtube.com/watch?v=gzAK65N4ruc