Unknown country codes

Could someone please specify which countries the following codes represent in Thomson One?

DE
FF
FL
HI
IL
KS
ME
MN
ND
NH
NJ
NY
OH
OK
OR
RI
TN
TX
UN
UT
VA
WA
WI
WV

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thomson-one

Thanks to @gteage01 for this answer:

OOO but to me these look like United States state codes, ie.
TX = Texas, NJ = New Jersey ...

I do not know this product, but looking at the standard Alpha-2 ISO country code list I find a few:

That said, this answer might be completely wrong, because I cannot find the other codes from your list.

Are you 100% sure these are country codes ? How did you obtain this list ?

Thanks to @gteage01 for this answer:

OOO but to me these look like United States state codes, ie.
TX = Texas, NJ = New Jersey ...