"Name a country with 'U'!"

Nice tool this map on the lower right side. I'm very pleased to see not only Singapore and Germany but also Sweden and Austria in the list and I know who that might be.
However, it seems, we also have visitors from the U.S. I figured out Illinois last week and yesterday it was Ohio. Random guests? Maybe, but if not please let me know who it is, because I'm quite curious and interested.
Cheers.