The US is the largest country with english speakers, but it does not have the majority of speakers [1] (just India plus Pakistan have as many). So your assumption would be wrong, even based on statistics.
That's why I qualified it with "native" - the US has by far the most English-as-a-first-language people. In my head everyone speaks like an Anglo guy from Idaho, and since HN is text-only, metaphorically speaking the lights are out, so I'm left without a clue where other people are sitting or where they are from.
In other words, if you found yourself in a dark room with a thousand English speakers who all sounded like Jesse Pinkman, what country would you assume you were in?
[1] https://en.m.wikipedia.org/wiki/List_of_countries_by_English...