Yeah, but I'd argue those countries either have people being decently fluent in multiple languages (which is not what this graph implies) or they have evolved their institutions and society in a way where meaningful societal and political participation is possible regardless of what language you speak. I don't think the US is at that level, and I think it being that way if this is lived reality for a lot of Americans IS a systemic failure.

The failure is not necessarily having multiple languages spoken, but the institutions not reflecting this reality. So you can either invest in people being fluent in a common language in addition to whatever languages they may speak OR redesign institutions and reshape society. Not doing any of the two is a systemic failure imo.