She said the Magical Congress relocated to Washington DC to avoid the [Revolutionary] war! (I wish I had screenshotted it at the time, because it's apparently since been corrected to 'what is now Washington'.) That's not just 'not bothering to do research' that's 'does not actually know anything about the subject and couldn't even be arsed to Google'.

Logical worldbuilding and internal consistency are not really Rowling's thing.