If Europe seeks a new political constitution, though, a dramatic lurch towards a rejectionist or extremist party on one country could lead to a break-up of the club.
How much Chicago has changed in the past 20 years was shown by what happened or did not happen after the disaster in a city-centre nightclub on February 17th, when 21 young people, all of them black, died in a stampede after the club's bouncers used pepper-spray to breakupa fight.