Found this

All that changed with the invention of the cotton gin. Massachusetts’ Eli Whitney patented the invention in 1793. It allowed cotton seeds to be separated from the fibres ten times faster than by hand, allowing cotton production to speed up exponentially. After the invention of the cotton gin, the value of US cotton crops increased from $150,000 to $8 million in ten years.

https://www.royalqueenseeds.com/blog-hemp-and-cotton-which-is-the-better-textile-n1087

Also, there was some stuff about Russia, Napoleon and the British. They still put the claims that hemp takes up less room, water and pesticides, which makes it a better crop. But, they admit that cotton is softer at the start.

Between cotton/wool/hemp , I guess there will always be the argument. However, most people who want hemp to be legal seem like a bunch of potheads who just want to grow their own cannabis.