And they would be wrong. Japan was militarily active in China long before any oil embargo. Sept 19 Japan invaded Manchuria following the Mukden Incident
http://ww2db.com/battle_spec.php?battle_id=18
BTW who is FRD? The US President during WWII IIRC was Franklin D. Roosevelt.
Correction on my post#63
Sept 19, 1931 Japan invaded Manchuria following the Mukden Incident