Rebuilding on the cheap: hoping others pick-up the slack

DC has earmarked $2.5 billion to rebuild Iraq, well below what will be needed to actually get the job done. According to this Times article the reasoning behind the low-ball figure is they're hoping other countries will cough-up the rest.

Caught a report on this issue on News International last night and the estimates are closer to $100 billion. Last week someone else noted the oil revenues won't begin to cover it.

So where is it going to come from? And why should other countries contribute when contract bidding is closed and then awarded to U.S. hand-picked companies?