What a lot of people don't realize, is the expansion and search for raw materials is ultimately what brought the US into the war. The US cut off oil shipments to Japan because of their expansionist policies and Japan attacked the US to prevent us from reacting to their further search for raw materials.
Personally, I think FDR was trying to get the US into the war as an active participant and Japanese expansion provided the opportunity. The attack on Pearl Harbor provided the excuse. The US had managed to break the Japanese diplomatic codes in late '41 and knew that relations were at an impass with the Japanese. When the attack occurred, two US carriers normally stationed at PH were on their way to Midway and Wake Islands delivery aircraft. Some conspiracy theorists think that FDR may have had foresight of this attack and ordered the moving of material to these islands. However, there is no firm information on this and time and time again the US government has been cleared of any conspiracy. I think most people thought the attack from Japanese was going to take place in the Phillipine Islands. Japanese Admiral Yamamoto did not agree with the attack on PH and told the Emperor an attack on the US was a bad idea. He had studied at Harvard and knew the industrial capacity of the US.
Okay, kind of took off here, but I love talking WWII.