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The last formal declaration of war by the US was during World War 2.

We got very good at gray area nonsense. The Korean War is not a war, it's a conflict. The Vietnam War is not a war, it's an engagement. We have police actions, "peacekeeping" operations, and a hundred other things...but not "wars".

We have the "global war on terror" and the accompanying Authorization for the Use of Military Force, created in the wake of 9/11 and still in effect today.

Congressional approval of military action is fundamentally dead.