To land a several million man invasion force on the Californian or Carolina coast and keep the supply lines open is somewhere in the realm of the nonsensical
And yet we managed to do just that to Europe and the Pacific islands during WWII. Admittedly we had the England, Australia, and Hawaii for staging areas but that was only because we could keep the supplies coming in spite of the U-boats and Japanese Navy. If it hadn't been for that we would have had to start from here.