Immigration is all about cheap labor. In the US there's a reason why so many seasonal workers come in illegally. It's because it's cheaper for the agricultural overlords and they make greater profits needing to pay undocumented workers less. Remember the money, it's always about the money.
The corporations want us to be xenophobic, they want us to hate "illegal aliens" for "stealing our jobs" because it allows them to continue to profit at record levels.