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So I read an interesting overview of the US war plan RED-ORANGE which was a strategy for conducting a war against a coalition of the UK and Imperial Japan. Now I know war pan RED has been done to death on AH.com but I noted one of the quotes stated by the Army-Navy Joint Planning Board of the state of readiness of the United States for an invasion of the Pacific:
"If 200,000 men of any first class hostile power should be landed on our Pacific Coast, we should have no course but to hand over to a foreign nation the rich empire west of the Rockies, with its cities, its harbors, and the wealth of its valleys and mountains."
Do you think the Joint Planning Board was correct in this scenario? Would it really be that easy for a power like Japan to carve apart the early 20th century western states of the USA (I believe the above statement was made during the Woodrow Wilson era)? What would a Pacific invasion of the US by a RED-ORANGE Coalition look like?