We aren't getting 10s of millions in the last 20 years the population of illegal immigrants has grown by about 2 million.

https://www.pewresearch.org/short-reads/2023/11/16/what-we-k...

The majority speak English especially after living here for 5+ years.

There are more than enough jobs to go around which is why immigrants only have a problem supporting themselves when not allowed to work.