Imagine a different Nov. 4, 1979, in Tehran. Shortly after Iranian terrorists storm the American Embassy and take some 90 American hostages, President Carter announces that Islamic fundamentalism is not a legitimate response to the excess of the shah but a new and dangerous fascism that threatens all that liberal society holds dear. And then he issues an ultimatum to Tehran’s leaders: Release the captives or face a devastating military response.

What went wrong with the West--and with the United States in particular--when not just the classical but especially the recent antecedents to Sept. 11, from the Iranian hostage-taking to the attack on the USS Cole, were so clear? Though Americans in an election year, legitimately concerned about our war dead, may now be divided over the Iraqi occupation, polls nevertheless show a surprising consensus that the many precursors to the World Trade Center and Pentagon bombings were acts of war, not police matters. Roll the tape backward from the USS Cole in 2000, through the bombing of the U.S. embassies in East Africa in 1998 and the Khobar Towers in 1996, the first World Trade Center bombing in 1993, the destruction of the American Embassy and annex in Beirut in 1983, the mass murder of 241 U.S. Marine peacekeepers asleep in their Lebanese barracks that same year, and assorted kidnappings and gruesome murders of American citizens and diplomats (including TWA Flight 800, Pan Am 103, William R. Higgins, Leon Klinghoffer, Robert Dean Stethem and CIA operative William Francis Buckley), until we arrive at the Iranian hostage-taking of November 1979: That debacle is where we first saw the strange brew of Islamic fascism, autocracy and Middle East state terrorism--and failed to grasp its menace, condemn it and go to war against it.

But if we know how we failed to respond in the last three decades, do we yet grasp why we were so afraid to act decisively at these earlier junctures, which might have stopped the chain of events that would lead to the al Qaeda terrorist acts of Sept/ 11? Our failure was never due to a lack of the necessary wealth or military resources, but rather to a deeply ingrained assumption that we should not retaliate--a hesitancy al Qaeda perceives and plays upon.

Throughout this tragic quarter-century of appeasement, our response usually consisted of a stern lecture by a Jimmy Carter, Ronald Reagan, George H.W. Bush, or Bill Clinton about "never giving in to terrorist blackmail" and "not negotiating with terrorists." Even Mr. Reagan’s saber-rattling "You can run but not hide" did not preclude trading arms to the Iranian terrorists or abruptly abandoning Lebanon after the horrific Hezbollah attack.

In contrast, George W. Bush, impervious to such self-deception, has, in a mere 2 1/2 years, reversed the perilous course of a quarter-century. Since Sept. 11, he has removed the Taliban and Saddam Hussein, begun to challenge the Middle East through support for consensual government, isolated Yasser Arafat, pressured the Europeans on everything from anti-Semitism to their largesse to Hamas, removed American troops from Saudi Arabia, shut down fascistic Islamic "charities," scattered al Qaeda, turned Pakistan from a de facto foe to a scrutinized neutral, rounded up terrorists in the United States, pressured Libya, Iran and Pakistan to come clean on clandestine nuclear cheating, so far avoided another Sept. 11--and promises that he is not nearly done yet. If the Spanish example presages further terrorist attacks on European democracies at election time, at least Mr. Bush has made it clear that America--alone if need be--will neither appease nor ignore such killers but in fact finish the terrible war that they started.

As Jimmy Carter also proved in November 1979, one man really can make a difference.