If you think America gave the world the telephone and television, I don't even know where to begin...
So instead of correcting the list I'll put forwards what I think is the biggest contribution to human culture made by the Americans; their space program. Sure a lot of the key scientists that made the first orbital flights and moon landing possible were foreign and it was all based on German technology, but nobody else would have brought it together and thrown enough money at it to make it happen. In the part of the world that wasn't about to collapse, anyway.
The points made above weren't that America had made zero contributions anyway, it was that they don't care to experience others' (watching our television and talking on our telephones excepted...)