How did inventions of the cotton gin and the sewing machine and factories go together?

Over the course of time, the device and Whitney's techniques were used to make many others products. ELIAS HOWE used it to make the first workable SEWING MACHINE in 1846. Clockmakers used it to make metal gears. In making the cotton gin, Eli Whitney had played a major part in expanding slavery. In making the MILLING MACHINE to produce precision guns and rifles in a very efficient and effective way, he set the industrial forces of the North in motion.

They all made doing tasks easier , quicker , more efficient . They also required less people.

It all depends on the individual