"Therefore be it Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, That the state of war between the United States and the Imperial Government of Japan which has thus been thrust upon the United States is hereby formally declared; and 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 the resources of the country are hereby pledged by the Congress of the United States".
Now set that against the sorry record of failure and defeat in Korea, Vietnam, Iraq, and so on. What is missing?
"The President is directed"..."All the resources of the country are hereby pledged"
Now, it's true that the existence of intercontinental delivery systems for nuclear weapons required a (very) expanded view of the "repel invasion" exception to the above...but the principle stands.
It is clear from the record the Legislative branch has consistently agreed the Constitution does not require the Executive branch to have a formal declaration of war by both chambers in hand prior to initiating, let alone continuing, military operations.
Given that, IMO it will be a sad day for the U.S. with the realities of our present world if our politicians do indeed so tie a Presidents hand.