Historically, immigration to the United States has been cyclical. In times of labor shortages, large numbers of immigrants are admitted to fill them. When the labor shortage ends and  unemployment is high, immigration has to be reduced. Right now, unemployment and especially under-employment are at near-crisis levels.

It is also inaccurate to compare today's immigrants with those of previous generations. When Nussbaum's grandfather-in-law came, there was no public housing, no food stamps, no affirmative action, no Medicare; immigrants came and made their way without demanding support from the taxpayers. There was no Facebook, no dual passports, no cell phones, no "global citizens"; immigrants left their country and connections behind and strove to become loyal Americans. 

There is a humongous difference between Hans Gulde and Zeituni Onyango and anybody who tells you there isn't is trying to manipulate you.

https://www.youtube.com/watch?v=QHoAuk76fT8