Depends on the instance. A lot of instances let themselves be overrun by US reddit reposters, filling every community, and they moderate none of it.

At least on lemmy.ml we try to keep US content quarantined to US-specific communities.

The US Empire, in Marxist analysis, is the international dictatorship of the bourgeoisie, supported by its vassals like Canada, Australia, western Europe, Japan, the ROK, etc. As the US Empire decays, world imperialism weakens, and the ability for socialism to rise gains.

I see lots of non-Statesian content too, mostly from the communists. Lemmy.world tends to be Statesian centric, but is far from communist.

One place in the lemmyverse that’s been able to buck US-defaultism a bit is the news mega thread on Hexbear. That was done by seeking out and elevating news and voices that are explicitly not in the US (and the Global North, more broadly). But even then, you need both people who are actively seeking non-US perspectives AND people who have those perspectives and are willing to invest their time. I’m not sure how to replicate this more broadly in the lemmyverse, but it’s worth noting where it’s worked and what was done.