The initial strategic decision which dictated our course in this war was adopted by the secret at Washingtion in March 1941 between the British and American Joint Chiefs of Staff. Rear Admirals R.L Ghormley and Richmond Kelly Turner, and Captains Alan kirk and DeWitt Ramsey represented the U.S, Navy. The decision there made, incoportated in the ABC-1 Staff Agreement of 27 March 1941, was this: If and when America enters the war, she will exert "the principle United States military effort" in the European theater.
Morison, Samuel Eliot
"Thoughts on Naval Strategy, World War II,"
Naval War College Review: Vol. 51
, Article 7.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol51/iss1/7