I detailed my idea for reducing America's growing reliance on immigrants recently.
Your product or service is a commodity if you don't provide anything but a product or service. Provide something extra and you get the opportunity to charge more because the product or service is now worth more. Charge more for your product or service and you get the opportunity to pay your employees more. Pay your employees more and you get the opportunity to select Americans for your employment pool.
Make price your only benefit and you're forced to hire cheap labor. Americans can't live off minimum wage, but our new citizens can. They're used to a much lower quality of life. They'll stick it out and work for minimum wage. Providing a cheap product or service means that you're hurting the overall health of our nation.
Read this if you don't believe me.