Bush Declared Operation Iraqi Freedom A Success

On May 1, 2003, Bush declared Operation IRAQI FREEDOM a success. While the war had been easily won, the national reconstruction of Iraq posed a number of challenges. Of these challenges, which posed the greatest threat to a reconstructed Iraq, and why?

Bush declared Operation IRAQI FREEDOM a success

Question
On May 1, 2003, Bush declared Operation IRAQI FREEDOM a success. While the war had been easily won, the national reconstruction of Iraq posed a number of challenges. Of these challenges, which posed the greatest threat to a reconstructed Iraq, and why?