The Chaldeans have owned/operated the liquor/tobacco/porn business for 15 years in the San Diego area. They have lots off money, big houses and fancy cars. I always suspected there was more going on. Their big church building on Chase & Anza in El Cajon was vacated and sold over the last year. Many Iraqis that hung out at the Starbucks at Jamacha & Willow Glen have disappeared in the last year. Bad economy.
It is entirely possible that these folk were admitted legally by Bush I or II. The Chaldean Christians have probably been a persecuted minority in Irag. At least I noticed in the past year or two their churches have been attacked and people killed. I also read that their numbers in Iraq have been greatly reduced in the past decade.