The US oil sanctions were in 1941. At that point war was inevitable, the sanctions were a response to Japan's military machine rolling across British Commonwealth territories in the Pacific. The US wasn't formally aligned but was strategically aligned with the British and Commonwealth nations and the sanctions were a response to Japanese military aggression. The sanctions didn't start anything, they were only an action in the middle of a larger conflict, and it's a funny way to frame them as starting a war when they were a non-military response to Japanese military attacks.