We fought a brillliant war for the first two weeks to conquer the country, However, the President, the Pentagon, the Military Commanders, and the State Department, did not plan to deal with the aftermath. Worse, once they did develop a plan after they were already on the ground, it did nothing but exacerbate the situation. Pres Bush, Sec of Def Rumsfield, Sec of State Powell, The CIA, and GEN Franks are all at fault for failing to collect intelligence, for failing to analyze it properly, and for failing to have a plan.
The amazing thing is that the only plan we had in advance was to conquer the country and then to leave them to their own devices after three months.
I don't say this as an anti-war liberal but as a retired Army Conservative who has done some reading on what happened during that initial period.