Several times in history we have declared war. The last time was in December of 1941, following Pearl Harbor. Since WWII we he used our military more than 100 times, in every continent of the world except Antarctica, and not one of those actions was a legitimately declared war.

Declaring war has gone completely out of style. The last nation to declare war that I know of was Uruguay declaring war on Nazi Germany when the war ( WW2) was almost over. ( 1945)

On who? When? Details?

No, not recently. But we have in past decades.

No. I dont think so