I live in the US and have a local US IP. A year or so ago, I made a site for a side project using vanilla HTML. No frameworks, no JS. Every word on the page was in English and could be found in an English dictionary.
When I first stood the site up and tested it, Chrome would always break in as soon as it loaded, with a popup to translate the site into _English_ from _Romanian_!
I was able to suppress this only by turning on every single language hint in META.
heh
in my case I wish it was based on my IP
but for some unbeknownst reason, some components of the page are in Russian. I'm not in Russia; nothing in my browser request indicates I'd like to read Russian.