For unascertained reasons, the rest of the world seems to like to "join in" with us in the U.S. from time to time. We don't have a lot of major sports championships (really, the World Series (a misnomer) and the Super Bowl are pretty much it). For some reason, people like to "feel American" for a few hours or a day or so. Much more than that and it would drive them nuts, but to grab onto a little of the "little country that could", it seems many like to share in it a bit. Go fig. <shrug>