Earlier quoted context omitted.
What’s wild is that the entire concept, as we know it, of “undocumented workers” only existed for the past ~22 years.
[flagged]
"Southern California" was/is a very, very big area. I grew up southeast of downtown.
Can you share where/when you grew up? Just curious.
As far as 'replacement': I can't dismiss such opinions out of hand, but for another anecdote: two of my great grandparents, who came from Germany in the late 19th century, lived in the US for many decades and never learned English that well.
Their children, my dad's father, of course spoke English fluently.