Really?
Well, according to the Bush administration war hasn't been declared, only the use of force was justified.
GONZALES: There was not a war declaration, either in connection with Al Qaida or in Iraq. It was an authorization to use military force. I only want to clarify that, because there are implications. Obviously, when you talk about a war declaration, you're possibly talking about affecting treaties, diplomatic relations. And so there is a distinction in law and in practice. And we're not talking about a war declaration. This is an authorization only to use military force.
http://en.wikipedia.org/wiki/Declaration_of_war_by_the_United_States
Have a nice day.