While that work is somewhat controversial, it is clear that there is no evidence that suggests Americans are stupid. You are wrong on every point. If you're going to make up accusations of a lack of intelligence and generalise about a nation of 300 million people, you should make sure you actually have some evidence to back up your claims. When you consider the great influence that Americans have had on society and for the benefit of the human race - people like Ernest Hemingway, John Steinbeck, John F Kennedy, Jimmy Carter, Martin Luther King, Isaac Asimov, Alexander Graeme Bell, etc. then it is clear that there are many Americans who are not stupid, and people who come from America are no more or less likely to be stupid than any other person. Our knowledge of biology also tells us that it is extremely unlikely that the location that a person lives in has any bearing on their intellectual facilities.
I am an Australian, and have never visited the United States. I have many problems with parts of American culture and with many of the political decisions that the US government makes. However I also do not hold the people of America account for those decisions. It is clear that they are not responsible and that they are generally no less intelligent than anybody else. You may lack the intellectual capacity to differentiate between the decisions of a government and the decisions of individual people, but it is obvious that your assertion that Americans are stupid is false and that you are wrong.
Fu
ck me running...I knew there was a reason I love the Aussies. Lemme just say thanks, beast, for coming to our defence so adeptly.
Oh, and you forgot about Heinlein, mate. He was at least as influential, if not more so, than all those people you named. Admitedly a bit of a nutter, with something of an Oedipus complex, but still...