Looks like there are still a few mid-2010's debut players whose nationality is listed in the database as American when it shouldn't be. One I just came across is Miguel Castro (castrmi01), who is Dominican (no second nationality listed). I have seen a few others, but biffed on writing them down
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ETA: Found another one with Elias Diaz (diazel01), listed as American but actually Venezuelan.
ETA2: Also Wilmer Difo (difowi01), listed as American, actually Dominican.