Even as someone from one of those countries (which, btw, is most of them), this threw me off after tracing the traffic flow and realizing that actually using the thing to go anywhere but immediately to your right would lead you into into the oncoming lane from a different road. Also hey screwtape
Unix-based systems traditionally represent timestamps as "seconds since 1970-01-01". If some program requires a modification timestamp for some file and no accurate value is available, it will commonly use the value 0 as a default. When other systems carefully preserve that value, it leads to files with 1970-01-01 timestamp.
Spreadsheets traditionally represent timestamps as "(fractional) days since 1900-01-01". In the same way, asking for a timestamp when no valid information is available will often get the value 0 as a default. Since businesses run on Excel, there's a lot of transaction records with a 0 timestamp in Excel spreadsheets out there.
One last wrinkle: The first wildly popular spreadsheet, Lotus 1-2-3, had a bug: it assumed that the year 1900 was a leap year, so it assumed 1900-02-29 existed, and so every date timestamp after that point was off by one. When Microsoft created Excel, they carefully reimplemented that bug for compatibility's sake, but if you're a historian looking at the data, you might reasonable assume that spreadsheets stored timestamps as "(fractional) days since 1899-12-31". If you're storing timestamps in some different format, it might not be obvious that those are zero dates - you might assume there's just a lot of transactions processed on that day.
I knew the 1970 thing but didn't understand the provenance of the 1899 one; I assumed it had something to do with the Y2K bug (as a colleage of mine put it, "1899 and 1999 were two very different years, but they had one thing in common: the next year would be 1900")
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Kentucky (KY) is there. The ones I picked up as missing quickly are North/South Dakota, Pennsylvania, and New Mexico. That leaves three I managed to (not?) miss looking at the map alone. (edit: Kansas, Indiana, Nebraska after a few more minutes)
pennsylvania and delaware have been removed (2), maryland and west virginia were moved north to fill the gap. new mexico is removed (1) and wyoming is moved to hide it. kansas, nebraska, and both dakotas are also removed (4) which takes you to the normal 48 you'd seen on this type of map. I'm not sure how that was done without looking at a real map but I have a gut feeling iowa/missouri/arkansas were shuffled somehow to accomplish it.
Linguists, settling some inscrutable grudge, have been steadily sneaking more backdated synonyms for 'sharing borders' into the dictionary. They've added 'contiguous,' 'coterminous,' 'conterminous,' and next year they're adding 'conterguous.'