Re: At the border...
Even a minor airport that has never seen an international flight can be regarded as a port of entry.
This might be technically correct, but I don't believe there are any US Ports of Entry which don't actually have regular international traffic. A PoE has to be officially designated and staffed with CBP personnel; it's not an arbitrary label.
According to one source, which cites a study by Pew, in 2015 there were 314 PoEs in the US, with at least one in every state. Even under the 100-mile "extended border" (within 100 miles of the actual border) and "functional equivalent" (Ports of Entry) rules, that leaves a fair bit of interior territory in the US that's not under CBP jurisdiction.
However, the vast majority of the population lives within the extended border and functional equivalent. Of my two homes, the Stately Manor is in the EB (because it's in Michigan, and all of Michigan is covered by the EB); the Mountain Fastness is probably outside the FE, but not by much.
Biting the hand that feeds IT
