As we observe another anniversary of the Sept. 11, 2001, attack that shattered American life 18 years ago, its full impact is still unfolding. Those who planned it succeeded beyond their wildest dreams. The airborne assaults that took nearly 3,000 lives on that day may now be seen as the most diabolically successful terror attack in history. That attack not only wreaked carnage at the World Trade Center, the Pentagon, and a field in rural Pennsylvania. It wound up dragging the United States into an endless state of war that has drained our treasury, poisoned our politics, created waves of new terrorism, and made us the enemy of millions around the world.