Why did plantation owners most prefer to use slaves over the indentured servants?

When this was published in early 1776, many american colonists became convinced that they should act to form a new kind of nation independent from the rule of britain's "cruel" courts

The expansion of the railroad networks led to

This civil war battle took place in northwest georgia in september 1863, and, following over 30,000 casualties in just two days, resulted in a confederate victory.