Page 1315 (actually page 5 in the PDF) has a graph which illustrates an interesting fact that many people don't seem to be aware of. The percentage of foreign-born people living in the United States is the highest it's been in nearly a century. There are some interesting correlated facts (such as % of people living in the US that aren't citizens being similarly record-breaking).

It seems crazy to me that this fact isn't part of the table stakes for any debate about US immigration. This isn't a liberal or conservative argument, it's just an acknowledgement of the fact that there's no precedent in living memory for the current number of foreign born, non-citizens living in America.

It's possible to stake out many positions based on these facts. Depending on your persuasion you could argue that the road to citizenship needs to be easier because we're creating a disenfranchised underclass; or you could argue that America is under assault from foreign influences; or you could argue something else. But it seems like this hugely relevant fact doesn't even get discussed in most public or policymaking discourse.