I read the following post on Daily Kos and thought it fit in perfectly with your thread:
Leveraging xenophobia, and every other incidental difference between individual Americans, is the heart and soul of nearly all Bush administration's policies, foreign and domestic. This constant appeal to our most primitive fears - of scarcity, of violence, of foreigners, of our neighbors - is a calculated manipulation designed to divide Americans against each other, and it is destroying the very premise upon which this country was founded: E Pluribus Unum, "out of many, one."
For this administration, out of one nation, many splintered factions are being created in a systematic way. Take a look around.
Consider how the Social Security privatization debate pits the young against the old, how tax cuts pit the rich against the poor, how the immigration debate pits underpaid native-born Americans against cheap laborers. Listen to the right-wing rhetoric about the "war on Christians" and think about how feeding the paranoia of the fundamentalists sets that faction up against nearly everyone else, even tolerant Christians. Anti-intellectualism, railing against affirmative action policies, labeling pacifists as "traitors" ... these are all divide-and-conquer tactics, used and abused throughout human history.
The truth is, every American can be sliced half a dozen different ways: by gender, by class, by education, by age, by region, by religion ... and in this day and age of niche marketing, even by whether we are NASCAR fans or latte sippers. And the Bush administration has figured out, if you slice us, ultimately you can dice us.
We are a nation devolving to tribalism under this administration, and this nurturing of the worst side of human nature has allowed us to accept policies that were unthinkable a mere six years ago: We can torture people, because they are foreign and different. We can wiretap anyone, because we are a nation bursting at the seams with people harboring different ideas. We can calmly discuss in the halls of Congress slapping a felony on Samaritans who give water to human beings dying of thirst in the desert, if the dying are foreign and different. We can draw up plans to use nuclear weapons on people who are foreign and different. And so on.
http://www.dailykos.com/storyonly/2006/4/10/141932/724