It's all over. It doesn't matter if you are smarter, or have a degree or a diploma. I have a clear and concrete case, my wife. She studied 6 years as a dietitian in the national university in Guatemala. Came here, can't do, you need to take this and that classes. She couldn't get some paperwork, so she is working in the same environment, watching how dumb "dietitians" with 2 years of study earn 2 times her salary.
Then, the clerks. They have been there for years, and their salary increase doesn't have any ceiling. But hers does. She is earning $5-$10 less, per hour than clerks after 11 years of holding the same position.
I guess we can call it the land of opportunity.