novaphile
Quester of Doglets
No fantasy at all. Visa overstayers are indeed "illegal aliens" by proper definition of that term. By far the majority of these come through airports and are vetted by border security there. Most visa overstayers are not from Mexico, although more recently a greater proportion are. But as I wrote, most official "illegal aliens" in the USA have been already properly vetted by border security and permitted into the USA. They did not have to swim a river. They just overstayed their visa for whatever reason. It happens in lots of countries, by the way.
Perhaps you are miffed that the pejorative you "posted exactly" was actually wrong. As was your understanding of the term.
I'm probably out of date, but...
... when I was working in the Commonwealth Public Service, back in the late nineties, we had a significant problem with 'illegal aliens' from the United States of America.
Exactly as you describe. They'd enter legally as tourists, and then overstay their visas.
(In some cases, intending to stay permanently.)