that may be technically true, although I think a good argument can be made that ever since WW2, the Congressional declaration of war has been superceded by the War Powers Act and Authorizations for use of force. They're de facto the same thing, if not de jure. For whatever reason, the United States no longer declares war on anyone, it's become an outdated/obsolete notion. Nowadays, the Congress just authorizes the use of force, it's the same thing.
You could not be more wrong.
First of all, it is the People of the United States who declare war, acting through their representatives in Congress assembled.
Here's the punch line of the December 8, 1941 declaration: " the President is hereby authorized and directed to employ the entire naval and military forces of the United States and the resources of the Government to carry on war against the Imperial Government of Japan; and, to bring the conflict to a successful termination, all of the resources of the country are hereby pledged by the Congress of the United States."
"All the resources of the country are hereby pledged by the Congress..."
THAT is precisely what has been missing from our military actions since June 25, 1950, and it is also what is missing in Iraq today.