This is the third or fourth such question in as many weeks. How would China and Russia get here? How would they past the US Navy (which is larger than all other navies combined)? How would they get past the navies and armies and air forces of all of the US's allies? How would Russia and China affect such an attack without risking nuclear annihilation?

Can you imagine the size of the invading army to occupy all of the US and Canada? (Oh, and Australia, New Zealand, Japan, South Korea, Philippines, Thailand, Turkey, Saudi Arabia and essentially all of the European Union). China and Russia don't have blue water navies. They have modern submarine fleets. Neither of them are as large as the American one. But even if they were, a submarine fleet isn't sufficient to invade the most powerful nation in the planet.

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