The Canadian province of New Brunswick (which was part of the UK at the time) had a bloodless war with the US state of Maine in 1839
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The handbook issued to US soldiers in Britain during WW2 included the line "The British don't know how to make a good cup of coffee. You don't know how to make a good cup of tea. It's an even swap."
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In 1916, a US amendment was proposed to put all acts of war to a national vote. If you voted yes you would have to register as a volunteer for service in the United States Army.
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A WW2 observation pilot, bored of not being in combat, decided to strap 6 bazookas to his plane. He destroyed several enemy tanks and vehicles. His name was Lt. Col. Charles Carpenter, aka Bazooka Charlie / The Mad Major.
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During World War 1, Harry Houdini took 1 year off performing to help sell war bonds and teach american soldiers how to escape from German handcuffs.
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