Uneducated immigrants are a far smaller group than uneducated natives. Believing that they are nonetheless the bigger problem is a sign of a racist perspective, albeit not a guarantee of one, perhaps it’s simply anti-immigration.

Additionally most immigrants don’t vote, so it doesn’t account for the current circus. When they do vote, they’ve become citizens by passing a test that many native Americans couldn’t pass.

Uneducation is a problem in general. Doesn’t matter who it is, immigrant or native. But uneducation is fixable problem if we as a society/culture wanted to fix it. We are currently working towards the exact opposite goal and doing it faster than ever.

PISA is not the only measurement. And it is not used by many countries, particularly Asian countries. It isn’t hard to look up other stats on US reading levels.

And again, comparing education levels outside of a historical context of politics and economics is not helpful, to say the least. And it says nothing about an individual’s ability or willingness to become educated once the opportunity presents itself, especially if they’ve already self-selected by making the effort to enter an environment that offers said opportunity. That should be obvious to a person who values and desires to protect American individualism, as you claim to be.