You find some articles via google search about things like "black lives matter" in Croatia and claim it is relevant there somehow. There was a BLM protest in Lithuania too (where I am from). There were maybe 10 black people in that protest. Half of them when interviewed said they were traveling through different countries (Estonia, Lithuania, Poland) to create and initiate those protest. Then if you look at the people who attended - mostly teenagers. When asked why they are attending this protest they came up with "to show solidarity for US". Which is to say - they are being fed US politics over the internet and found an opportunity to join an event here.
So that's how I see it. These US political things leak to other countries. Through media, through twitter and instagram, and now even through HN.