KS,
I believe that Microsoft, Apple, Alphabet, and Amazon for example, hire the most qualified and motivated employees available from a worldwide pool. And, they pay them accordingly and fairly without prejudice based on their intrinsic value. Why do you believe that farm employers hire Mexican dairy cow-milkers or crop harvesters? I have heard that they work harder and are more reliable than most people who are available for that type of work. 
I have observed that Hispanic carpenters make up most of the local construction crews who build in our area. Obviously, there is a demand for employees who have proven their value. Any sensible employer would want the most reliable and efficient employee in their organization.