Who are the simplest people to exploit? Poor people. They have a little voice in society.
As far as exploitation, Its not based on race, its based on differences and propaganda. Look back in history, blacks weren't originally exploited because they were black, they were exploited because the people in control wanted to make quick cash, and racism is propaganda to keep them down, and keep pockets fat. The fact that they were different was the excuse to be able to do the things they did. I mean, look at the irish, they look just like the english, yet they were, just like the africans, forced into slavery and exploited because of propaganda making them seem different because of religion and stereotypes. Racist people are just the pawns for the ones in control, because they are eating up the propaganda fed to them. All this shit is because of greed, not hatred.
I'm kinda rambling on bout some points so sorry if the structure of the paragraph sucks lol...