Why can Americans lead the world with such a low IQ?

First of all, the average IQ of the United States is indeed lower than that of Europe and Asia, especially far lower than that of China or Jewish people. Being ahead of the world does not mean its national IQ level, on the contrary, it has a great relationship with the inclusiveness, pioneering and history of the nation itself. By the way, almost 100% of the world's military and 90% of the world's commercial leadership benefited from the two world wars, especially Germany's scientific research achievements in World War II, from the exploration of rockets, stealth fighters and even flying saucers to computers, networks and nanotechnology. Based on the existing concepts and technological development, we can't say that the IQ of the United States, a multinational country, is very high, but we can see that it is very inclusive and flexible.