The Singer Company has always been based in the US, but for much of their history, they made many of their machines in the UK (Scotland). At one point, the UK plant production exceeded it's US counterpart. Due to a long trend of decreasing sales (partly due to people buying their clothes off the rack, rather than making them), the UK plant was shut down in1980.
Isaac Singer was an interesting character - at the time of his death he had fathered 24 (known) children with at least 5 different wives and mistresses, some of which he maintained relationships with concurrently!
That particular fact seems a little far removed to be on a US pop culture quiz though. Spock's home planet is an arcane fact that has nothing to do with the US. Questions about the show itself (maybe asking for the name of its creator or something) would be closer to the mark. The Globetrotters question, for example, just asks for the city, which makes sense. If it were to ask who is the Globetrotters' all-time leading scorer, I think that would be outside the scope of U.S. knowledge quiz.
I actually looked at the map to confirm this, and it looks to me like Tallahassee, Baton Rouge, and Austin are all pretty much on the same line. I didn't check coordinates, but I'd bet they probably cover the same latitude at points, but Austin reaches furthest south of the three of them. It's really close though.
the stats say that the average number of right answers is 13. i thought this was one of the easier quizzes and got them all right. there were only two questions that less than 50% got right, and they were both in the 40+% range.
Isaac Singer was an interesting character - at the time of his death he had fathered 24 (known) children with at least 5 different wives and mistresses, some of which he maintained relationships with concurrently!