Greenberg compares the illegall immigrants to generations of previous immigrants. The difference is in the word illegal. The hispanic hordes broke the law and snuck into our country, i.e. they invaded it. They are not immigrants but invaders.
And they are aided and abetted in their invasion by both political parties. I fear that now it is too late. Rather than joining American society as all previous immigrants did, they are changing it into what they left. The great American experiment in freedom is coming to an end with the Democratic Socialist Party and its illegal immigrant supporters. Tyranny is at hand.