edit: on a different topic: this thread was opened less than two weeks ago, and yet has already surpassed the "Non EU-Europe thread" and "Brexit conversation continued" thread. How did it get to 93 pages so fast?
It helps that Trump keeps generating new things to talk about.
But not only has news caused by Brexit all but stopped... but the UK is sort of having a weird "We want to leave, but we don't want to actually leave" situation that keeps stretching things out and making them extremely indeterminate. They want all the benefits of the EU but don't want to be in the EU... they want to break off from the EU laws, but they want to keep the EU laws. I am actually in a weird doubt the UK will leave the EU anyway, even though I can't see why they wouldn't.
While the "Non-EU Europe Thread" is just a weird sort of name.
It also helps that the American thread isn't strongly policed... While the Brexit is (Agree with them or else!) so anyone with an opinion is pretty much staying out because otherwise they have to read paragraphs upon paragraphs of retorts and insults.
Finally the American thread doesn't have super patriots (err what is the term again? Nationalists?)... While the Brexit thread does. So bringing up any issues is usually met with cold looks.
Plus it helps that there are more Americans and people who are well knowledgeable of Americans and American politics... compared to the UK and Europe.