Machines made it easier to complete hard tasks(such as the cotton gin) and they also could get work done faster than humans, which lead to a much grander scale of production in goods. Hope this helps :D
Taming animals for human use
"D. It proved that black troops could fight bravely and well" is true about the 54th Massachusetts Regiment, which saw extensive action during the Civil War.
Answer:
primary is from the person themself. secondary is somebody else writing about an event or person they are not or were not in.
