alternatehistory.com

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."

Source:http://www.globalsecurity.org/military/ops/war-plan-red-orange.htm

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?
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