Need help

This is a request for information.

I have checked all over the internet for the answer, and I have asked people I know all over the country and the political spectrum.

According to all statements about the number of undocumented immigrants, the figure is 11,000,000

The number is usually preceded by statements that these people are undocumented, in the shadows, in the underground, and are unknown and untraceable.

If that is the case, how do we know there are 11,000,000 of them?

Wouldn’t the fact that they are undocumented and in untraceable shadows make it hard to know the number?

Some people have lately claimed that the number has risen to 20,000,000.

Again, how does anyone know the number?

Or, did someone somewhere throw out a number, and now through repetition, that has become the number based on nothing beyond the repetition?

So, really, someone tell me how we know an unknowable number.

Oh, and don’t tell me some politician said so unless you can cite the politician’s source, and that source must be a real one, not another politician.

I just have a hard time accepting figure about uncountable people being so definite
 

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