Wasser... I am just going to point out one thing from your post and I am going to let this go, this is just a subject that we could just keep shooting back and forth at each other. I have to say, you have to start to think out of the box.
Not really. Hypothetically, if china invaded the US...think of how much food would be required to feed a standing army. How easy would it be to ship in thousands of troops across an entire ocean? I'm pretty sure we'd notice them coming.
China was the wrong Army to use for this hypothetical invasion.
China, 2 MILLION man army (almost 2.5 mil with Reserve). The USA 1.5 mil active and 1.5 mil in reserve. Now remember our Military is all over the world, they aren't sitting here in the USA to fight off a 2 million man Chinese Army coming over on a boat. Yes I agree far from likely they could load 2 million on a boat and land here with out us doing something, but how much could we do? There is only one way we could ever fight off a full China invasion, they would have to be nuked simple as that, there is no way in hell we could stop them with conventional weapons, impossible, we are good but we aren't that good.
Ok so lets say 1/2 (1 mil) of that China army hits our shores, well lets face it our NEW President sure wouldn't turn that key for Nukes... So you say, there is no way to feed them (you above, "think of how much food would be required to feed a standing army") and fuel their equipment (I say). Yep you are correct it would take a God's amount of food to feed them and I am correct, a God's amount of fuel for the equipment. Ok, step back for this one because from your post above that I quoted it looks as if you are stuck in a "box"... This is the USA, not some desert over seas, there isn't one piece of Cost line that they would/could step on that they couldn't find a damn Wal-Mart for the food or a Exxon station for their fuel, in other words "WE" (the USA) have all they need to support their 1 mil man army, shit I would bet (no, I know we do) we would even have all the ammo for their carry weapons.
In closing of this topic (for me)... I am NOT saying it WILL happen, but people have to get out of this "we can never be touched" set of mind, that thinking is what will get us in trouble. Believe me I think the USA is "bad ass' straight up, but so did the people of The Roman Empire, Germany and Iraq (just to name a few) think they were "bad ass" as well.