This deserves a lot more attention, I think. On September 10, General David Petraeus presented the slideshow  that’s fast becoming the 2007 version of Colin Powell’s presentation to the UN back in 2003 — flashy, high stakes, and more than a little misleading.
One of the catchiest slides was the fourth one, titled “Ethno-Sectarian Violence.” Along with a standard frequency against time plot, it showed a series of map of Baghdad with “violence hot spots” — density plots of violent incidents — flaring pre-“surge” and then dying down. Visually, the effect was pretty much like watching a fire going out, and the implication was that Bush’s brilliant surge was the fire truck that did it.
But there’s another reason fires die down: they run out of fuel. Matthew Yglesias  points to a post by Ilan Goldenberg  (“Democracy Arsenal”) that compares Petraeus’s maps to very similar maps presented by General David Jones  to Congress a few days earlier. The difference? The Petraeus maps show a Baghdad with neighborhoods that never change — this one’s majority Sunni, that one’s majority Shia, the other one’s mixed.
The Jones maps show that the Pentagon knows better: in July 2006, most of Baghdad was colored light brown for “mixed Muslim.” By July 2007, however, most of the city has been transformed into large swathes of dark green (75%+ Shia) and blue (75%+ Sunni).
In other words, there wasn’t much left to fight about; ethnic cleansing was nearing completion in Baghdad’s neighborhoods.
As smintheus  (“unbossed”) — possibly the first to report this on Monday — put it:
The maps falsify one of the most delicate of issues: The failure of the “surge” to stem ethnic/sectarian cleansing of Baghdad. If that information were brought to the fore, it would call into question the claims by Petraeus and other spokespeople for the Bush administration that the “surge” is responsible for an alleged drop in violence in Baghdad. If there is any such drop, it may be due in large part to the success of Shia attempts to drive Sunnis from their homes and into exile.
Raising, in turn, other delicate issues: if ethnic cleansing in Baghdad has run its course to this extent, what good are U.S. soldiers doing there — and how much harm is left to prevent? Can they come home now — all of them?
And will Congress ever get truthful testimony about Iraq from those responsible for beginning and waging this war?
And does anyone working there care?
UPDATE, 9/14: Incredibly, that’s not all just for this one slide. Robert Waldmann  noticed that the ethnic-sectarian killing levels almost certainly ignore the horrific August truck bomb attacks on the Yazidi minority that killed 572  people.
EDIT, 9/14: Link to Jones report (“Independent Commission on the Security Forces of Iraq”) added, map images (via Yglesias) added.
UPDATE, EDIT, 9/5/08: Figure descriptions added. Juan Cole  notes  that a Washington Post article by Karen DeYoung (via  ThinkProgress) provides similar maps  documenting ethnic cleansing in Baghdad between April 2006 and November 2007.