Howard Zinn explains how the American public was fooled into supporting the invasion of Iraq by President Bush-war (excerpt):

....If we as citizens start out with an understanding that these people up there—the President, the Congress, the Supreme Court, all those institutions pretending to be “checks and balances”—do not have our interests at heart, we are on a course towards the truth. Not to know that is to make us helpless before determined liars. The deeply ingrained belief—no, not from birth but from the educational system and from our culture in general—that the United States is an especially virtuous nation makes us especially vulnerable to government deception. It starts early, in the first grade, when we are compelled to “pledge allegiance” (before we even know what that means), forced to proclaim that we are a nation with “liberty and justice for all.” And then come the countless ceremonies, whether at the ballpark or elsewhere, where we are expected to stand and bow our heads during the singing of the “Star-Spangled Banner,” announcing that we are “the land of the free and the home of the brave.” There is also the unofficial national anthem “God Bless America,” and you are looked on with suspicion if you ask why we would expect God to single out this one nation—just 5 percent of the world’s population—for his or her blessing.If your starting point for evaluating the world around you is the firm belief that this nation is somehow endowed by Providence with unique qualities that make it morally superior to every other nation on Earth, then you are not likely to question the President when he says we are sending our troops here or there, or bombing this or that, in order to spread our values—democracy, liberty, and let’s not forget free enterprise—to some God-forsaken (literally) place in the world.It becomes necessary then, if we are going to protect ourselves and our fellow citizens against policies that will be disastrous not only for other people but for Americans too, that we face some facts that disturb the idea of a uniquely virtuous nation. These facts are embarrassing, but must be faced if we are to be honest. We must face our long history of ethnic cleansing, in which millions of Indians were driven off their land by means of massacres and forced evacuations. And our long history, still not behind us, of slavery, segregation, and racism. We must face our record of imperial conquest, in the Caribbean and in the Pacific, our shameful wars against small countries a tenth our size: Vietnam, Grenada, Panama, Afghanistan, Iraq. And the lingering memory of Hiroshima and Nagasaki. It is not a history of which we can be proud.....