I know this has been done to death time and time again, but I recently had a very interesting discussion with a friend of mine and we discussed a pre-1939 conflict between the United States and The Empire of Japan. What I wanted to ask is with a POD no earlier than 1915 what would need to happen to lead to an eventual conflict between America and Japan between the late 20's to mid 30's? And what exactly would this POD be? Also what effects would this devent have on world politics and economy? I’m curious to know what the intelligent and learned members of this board have in mind.