Well, the love of America no longer tugs at Superman's cape. In the 900th issue of Superman, The Man of Steel renounces his American citizenship.
Frankly, I'm surprised it's taken this long.
In December 2003, when Superman was re-released to comemorate its 25th anniversary, I attended a screening in Cambridge, Massachusetts. When Superman told Lois Lane he stood for "truth, justice and the American way" the theater broke out in laughter. It is worth remembering that in the 2006 film Superman Returns, The Caped Crusader stood only for truth and justice.
Then again it is probably just as well. Joe Shuster, the man who first drew Superman, was Canadian.