[1] https://cis.org/Report/Immigrant-Population-Growth-Slows
[2] https://rankingamerica.wordpress.com/2009/01/18/the-us-ranks...
A small slowing down, that still left immigration higher than at almost any other point in US history.
> US immigration is, like many things, at a historic peak because population size is at a historic peak. Percentage-wise, foreign born immigrants make of a record high proportion of the US population
Your second sentence directly refutes your first - US immigration is at a historic peak in both absolute and relative (compared to US population) terms.
> Our population is aging..
That's an argument that immigration is necessary, not that it's "very little".