The most interesting article on wikipedia

War Plan Red was a plan for America to make war with Britain. It was created in the 1920s, approved by the Secretary of War in May 1930 and then later officially withdrawn in 1939 at the beginning of World War 2.

For more information see the link below, i just thought you all might find this interesting, i did.

http://en.wikipedia.org/wiki/War_Plan_Red