The al-Qaida strategy of attacking the United States created its own form of blowback. But the triumph of militarisation after 9/11 exacted a deeper cost on the world, says Vicken Cheterian.
The world has been changed by the securitisation of everyday life and the Islamisation of security. The accompanying threat-complex has shifted American sensibilities, says Cas Mudde.
A focus on the violence of an Arab and Muslim minority skewed western policy for a decade. The great events of 2011 are a chance to think afresh, says Jane Kinninmont, whose life was altered by witnessing the 9/11 attacks.
America’s excessive reaction to the 9/11 attacks was the prelude to a decade of damage and injustice on a vast scale. An understanding of what went wrong is essential to progress in the next ten years, says Shahrbanou Tadjbakhsh.
The tragedy of 11 September 2001 was used by authoritarian forces in the United States as a political opportunity. The ensuing damage to liberty, legality and democracy has been deep, says Mariano Aguirre
The attacks of 11 September 2001 did not, after all, transform the world. But they did propel the United States into a unilateral and regime-change moment - and pose a more enduring challenge both to American and European conceptions of security and stability, says Volker Perthes.
A flawed response to terrorism on its soil brought the United States low. The lessons are also for the rest of the world to learn, says Rein Müllerson.
There is intense rethinking in the Pentagon about the “war on terror”. The outcome of the Libyan conflict will reinforce its principal trends.
The student movement convulsing Chile is aiming for social inclusion and reform of the model that improved the lives of millions in the 1990s. It should be seen in its own terms and not as a mere outpost of a global trend, says Patricio Navia.
The fate of Egypt across the centuries is indissolubly linked to the river which gives it life. Today, a range of problems - environmental, political, economic - threaten the provision and the quality of the Nile waters. They present another challenge for the young post-Mubarak order, says Vicken
The international response to the food crisis of 2011 is less energetic and coherent than during the last emergency, in 2008. Both economic understanding and political impetus need to be improved, says Simon Maxwell.
What are the principal lessons of the ten years of war since the 11 September 2001 attacks? Paul Rogers, whose first openDemocracy column was published a few days after 9/11, responds to three questions.