Depends how you define "war effort". Luftwaffe was present more on the eastern front in the beginning, later more on the western and practically entire Kriegsmarine was on the western front all the time. Western front as in fighting the western allies. Even knowing that, most of the German war effort supported fight in the east so I really don't think 70% was used to fight western allies.
Sorry, I just glanced before replying and thought you meant ACW, not American revolution. Yeah, you're right, but in that case there were many other factors at play (French intervention, war weariness in Britain etc...)
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