I wouldn't say America is boring.. I think it's quite interesting historically too.
The U.S. has been around for 200 years, but so what? They've accomplished more than civs who have been around much longer. I am against the entire "is a civilization/is not a civilization" thought most Civ players agree with. People define civilizations are large groups of people with a definitive culture. I use to think so to but I'm yielding on that definition.
The game Civilization is about alternate history and how you can be the Aztecs living on some arctic island waging a naval war against the English who live on a large jungle continent.
Now people recreate history and the Earth's alternate history with scenarios and mods, but the game is still based on complete fiction with non-fictional nations. I'd rather call the civilizations in the games nations. The term civilization means a different thing to everybody thus creating arguments, misconceptions, etc.
So who really cares if America's not really classified as a civilization? How is anything really supposed to be classified as a civilization? If America isn't a civilization then neither is England, Germany, Portugal, Spain, Netherlands, France, etc. etc. All you would have would be Egypt, Greece, Babylon, Sumer, and Persia.