One needs to wonder where all these immigrants are finding work for there is the thought that immigration legal, and illegal contributes to the economic well being of all Americans when understanding that when people purchase goods, and services they are also paying a sales tax that finances state, and federal spending.
I will remind you, once again that with a national unemployment rate of 4.7 pct per February, 2017 official figures
https://data.bls.gov/timeseries/LNS14000000 there is an awareness that the American economy is providing work for recent immigrants sufficient to encourage further immigration.
Were Antonio López de Santa Anna to resurrect from his resting place, and invade the United States with his Mexican army I would readily accept your characterisation of invasion...otherwise, illegal entry is patently an accurate representation of the facts.