Slavery is a 1500-1600's principle in which the laws of property are given to people as if they are on the same level of one's ownership. The practice of slavery and keeping slaves under ownership is very little to never seen today as there are laws installed against it. Slavery was common on plantations and plots of land where mass labor was needed to keep businesses/land in profitable shape. Slavery became unpopular in the late 1700's to 1800's as people realized that it was unethical and cruel to consider one as lesser or of a lower status than themselves; a strong example, the Democratic-Republican Party. Again, in the turn of the Industrial Revolution, many pundits further agreed that human labor was less necessary as machines could perform the functions previously accomplished by workers like slaves.