Not only did Roosevelt break trade treaties which were mutually beneficial with the Japanese because of his pathetic and misguided affection for the Chinese he collaborated with British and the Dutch and their eastern colonies to do the same. In other words Japan a country reliant on imports to maintain its industrial and war economy was now left with no ther choice than to attack. There was now effectively a total embargo on imports vital for them sustaining their nation. That is an act of war. Plain and simple.

Of course this is exactly what Roosevelt, Stimson and others wanted -- this is all well known now and even mainstream historians acknowledge it -- and its exactly what they got. Your points about 'Why don't they just build their own pumps' and 'well America doesn't have to sell its oil to anyone' are bizarre and totally miss the bigger picture.