If you go back to my post you'll notice that I already answered this. To summarize: A US embargo was probably inevitable at some point, but a US embargo in the summer of 1941 was actually a major mistake from the point of view of the western Allies. The more rational course for the US would have been to wait until summer or autumn of 1942 before imposing the embargo because by then they would have had a fair chance of keeping the Japanese from simply taking the Netherlands East Indies oil.