That is just the thing. You can march an army onto enemy soil, but in order for you to do anything there you need to control the population. That is much less possible when they are armed.
As far as it not being a deterrent in WWII, there is good evidence that Isoroku Yamamoto said:
There is no proof that he said it, but Douglas McArthur's chief biographer claims he did. It is one of those things that is likely, but not provable.You cannot invade the mainland United States. There would be a rifle behind every blade of grass.
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