Yeah, the geography certainly plays a role - much like it does for Britain having ~30 miles of ocean between it and the rest of Europe.
But the broad trend in the States has been a narrowing of languages. Like, a century ago there was national distribution for newspapers printed in German. Those started disappearing during WW1 and were completely gone by the end of WW2. And, of course, that is dwarfed by the number of First Nations languages that have been driven to the edge extinction, if not outright extinguished already.
I think if Lemmy wants to have less of a US bent to topics and perspectives, then they'll have to follow ich_iel's example and stubbornly commit to a language that isn't english. The way how the internet collapses geography, conversation trends toward orbiting the densest population of monoglots.