Such a situation is believed be a possible way to preempt violent ethnic cleansing, the Christian Science Monitor reports.
The idea likely of dividing the country by religion and ethnicity would not sit well with President George W. Bush who made a unified Iraq a chief goal, the report says.
Michael O'Hanlon, a senior fellow in foreign policy studies at the Brookings Institution in Washington, suggested Bush have someone checking out the possibility.
O'Hanlon said the United States might want to help Iraqis relocate to parts of their country where they feel safer. He noted the United States did that sort of resettlement assistance with Bosnia.