Why is the American general population considered "Stupid" when it comes to the world or other intellectual conversations?

I can understand that having a good intellectual conversation with an American is relatively hard because the Educational system in the USA is pretty much in the pits when you look at other Nations around the world. EU nations have far smarter students and even Jap and China have schools that promote the idea where the Strong survive. Where the USA has the idea "No child left behind". Means if you can get your grade 12 high school and not even have to work at it or try.

What's the problem in the USA why are the people there so dumb?
Why is the American general population considered "Stupid" when it comes to the world or other intellectual conversations?
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