Answer:
Interchangeable parts, popularized in America when Eli Whitney used them to assemble muskets in the first years of the 19th century, allowed relatively unskilled workers to produce large numbers of weapons quickly and at lower cost, and made repair and replacement of parts infinitely easier.
Explanation:
Colonial farmers grew a wide variety of crops depending on where they lived. Popular crops included wheat, corn, barley, oats, tobacco, and rice. The first settlers didn't own slaves, but, by the early 1700s, it was the slaves who worked the fields of large plantations.
So they (the slaves) were treated bad because they weren't considered human beings
