Destro,
You could use a little work on your people skills. I happen to have a pretty good understanding of the english language and how it is used, and your condescending statement is not appreciated.
Trade sanctions are not an act of war. Countries are free to do business with whomever they please. The refusal to trade with a country does not give them just cause to attack a country.
If Japan invaded Manchuria and did not have their supplies of steel and oil secured, that is not the problem of any other state but Japan. I would like you to explain how it is an act of war.
Trade sanctions that are enforced by military blockade are,in fact, an act of war. In Japan's case our trade sanctions were not an act of war but it was an act of aggression. Also, America was financing and supplying American mercenary units know as the Flying Tigers to fight the Japanese before Pearl Harbor. Pearl Harbor did not happen in a vacuum.