The US population is grouped together in one giant pool instead of spread out by state like Europe is grouped by individual country. We focus on national news that affects the large population, and stuff that happens on other states becsuse of the shared identity, while European countries don’t have the same kind of European Union shenanigans that affect all of Europe and mostly post about country level stuff. Communities in languages other than English also tend to be posted in separate communites further separating their discussions from the general purpose communities.

We are also louder, which also contributes, but that is not as big of a deal as the sheer numbers.