Comment by giaour

> What is a border when crossing it without permission is not illegal?

There aren't good statistics on how many undocumented immigrants overstayed a visa (and therefore legally crossed the border) vs how many entered without a visa, but experts estimate that it's somewhere around 40-45% [0]. It's not a criminal act to overstay a visa, though you do become subject to deportation. So a good chunk of "illegal immigrants" are doing something less illegal than, say, driving a car whose registration has expired (which is a criminal act), but, as another commenter noted above, we don't refer to "illegal drivers" on our roads.

The traditional term for someone who has not fulfilled a positive legal obligation like renewing their car registration is a "scofflaw," and I would not object to anyone referring to "scofflaw immigrants" the way I object to the phrase "illegal immigrants."

[0]: https://www.politifact.com/factchecks/2018/aug/24/kevin-mcca...