1. Defeating the Defense of Marriage Act.
2. The civil rights movement.
3. Electing its first black president.
4. Putting someone on the moon.
5. The Great American Novel.
6. Rock 'n' roll.
There's been a ton of great music amidst our amber waves of grain, and even though Britain can lay claim to the Beatles and the Stones, we're the ones who invented rock (and hell, blues) in the first place.