End All Wars and Punish the War Criminals. We should remind ourselves every so often about what our Constitution says about the “War Powers Clause” which resides within Article I, Section 8 of the United States Constitution. This clause sets forth Congress’ legal right to declare war when necessary. In relation to the exercising of war powers, it is estimated that only five known wars have been declared under the authority of the United States Constitution: These include: The War of 1812, Spanish/American War, Mexican/American War, WWI, and WWII. All other war conflict has been unconstitutional. Peace pays a dividend to all citizens, not just a few.