Compared to the rest of the modern World, we are "far-right". As a libertarian, I'd be politically extreme in any country in Europe. Even the USA Democrats are right of center compared to much of Europe. Besides, we like chanting it; its child-like fun.

"Far right", at least nowadays, in Europe has a very definite meaning that has little to do with economics (in that regard, "Far Right" parties tend to be the opposite than libertarian), but rather with their stance on immigration, religious, and social issues.

Yes, here in the USA, too, Right isn't an economic position. Hence the rise of Donald Mussolini Trump.

And English football fans: "Eng-err-land", "Two world wars and one world cup" etc.

Internationally perhaps, but in the European leagues the fans invent all sorts of comical/ribald chants.

Rare to hear US sport fans come up with anything other than booing, 'D fence', 'ref you suck' or yelling a player's name

Australia has "Aussie Aussie Aussie! Oi Oi Oi!" Usually a sporting chant, but it's sometimes used by Australian travellers to identify other Australians in a crowd (ie, yell out "Aussie Aussie Aussie" and see if anyone yells back "Oi Oi Oi!")

Well, there's sporting events... like the World Cup or European Championships, there every national shouts their own country's name without awkward duality feelings (even Germans, I just checked with one to be sure =)