The flag of the Philippines is flown with the red stripe up in times of war and blue stripe up in times of peace.
8
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.
5
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.
34
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
36
During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
25