At least for America, perhaps the most important lesson of 9/11 is that US foreign policy should follow the counsel given by President Dwight Eisenhower a half-century ago: Do not get involved in land wars of occupation, and focus on maintaining the strength of the American economy.
https://prosyn.org/UWDYQDf
CAMBRIDGE – Al Qaeda’s attack on the United States ten years ago was a profound shock to both American and international public opinion. What lessons can we learn a decade later?