Germans themselves are naturally very intelligent. Most Europeans are in fact very intelligent, contemporary, liberal and tolerant people. This is why the Netherlands doesn't throw people in prison over a plant called cannabis.
America, on the other hand, is getting dumber and dumber. Why?
1. Bad nutrition. Obesity and bad nutrition can lead to decreased brain function.
2. Bad living habits, no exercise.
3. Horrific education system. Terrible.
4. Bad social norms. Too much pride in stupidity and making fun of intelligent people.