The last time the United Kingdom officially went to war was in 1942 against Thialand.
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The last declared US war was WW2.
you declare war
france
The Prime Minister has the ability to declare war on another country. The Prime Minister would consult with the Queen or King first. The Queen or King rules over the military. If his or her Majesty agrees to the declaration of war the Parliament would be consulted next. However the PM can declare war on his or her Majesty's say so.
which governing body is able to declare war