美國經濟差是因為housing market cooling down導致home value drops, 而引起subprime mortgage crisis的關係, 跟打仗沒有什麼關係吧.
Supposedly when the private sector cuts back on the spending, the public sector should increase the spending and vice versa. However, 打仗把美國政府的錢打掉了, 使的美國政府無力在經濟downturn的時候, 提出任何counteract, which has great impact. Thus, we are seeing stagnation in the nation, no pun intended.
With all that being said, the war is not the root cause for economy downturn we are experiencing.