參照維基,美國在1941年7月26日凍結日本財產,8月一日禁運石油廢鋼等工業原料。1941年12月6日,珍珠港戰役爆發。

https://en.wikipedia.org/wiki/Events_leading_to_the_attack_on_Pearl_Harbor#:~:text=Responding%20to%20Japanese%20occupation%20of,and%20gasoline%20exports%20to%20Japan.

 

Responding to Japanese occupation of key airfields in Indochina (July 24) after an agreement between Japan and Vichy France, the U.S. froze Japanese assets on July 26, 1941, and on August 1, it established an embargo on oil and gasoline exports to Japan

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