SimuLord said:
I dunno, I grew up in Boston and by that logic "Beat LA" and "Yankees Suck" chants sure sound like a proud continuation of that European tradition.
Well yeah, Europe has regained a little sanity in the last 20 years. As for American history (as far as I know, I haven't studied it prolifically) has had a history of insular and isolationist policy even between states and the Federal government.
But unless I'm mistaken the US hasn't historically suffered as poorly as europe when it comes to soccer (or other sports) brawls. During the 70's in Britain for example, there were places where you didn't go UNLESS you were a supporter of a specific city soccer team.
'Threat of harm' label didn't really cover the instances of mass beatings and extreme violence perpetrated by the 'fans' (complete dickheads by any long extension).
People took matters of city (and even intra-city matters such as Manchester City and Manchester United soccer brawls of the 70's) as matters of personal reference and pride beyond national concerns.
'Football Hooliganism' they term it now I believe (albeit I remember it being called 'roughs' and 'roughhousings' but I'm probably older than most people online) still causes loss of life and massive infrastructure damage through vandalism and property damage.
As well as I know (albeit with no prolonged studied of American or Canadian society) these are not as analogous in former Western colonies.
For example ... State of Origin rugby series in Australia is about NSW vs Queensland in Australia ... and the slander you hear (even by news reporters on tv) would make most people blush ... but after all is said and done 'blues' and "maroons' still can sit down and drink together (despite incessant name calling).
Which sounds tantemount to your 'Yankees suck'-'LA Rules' situation. Namecalling and nothing else. Not really comparable to Europe.