I dunno, but we lost to them in Vietnam. They knew the terrian. Same reason we cant win shit in the ME. And a people with nothing to lose tend to be the victors throughout history. US is big land mass. Even if it was all out war, lots of ground to cover and again, the local people know the local terrain.

And obviouslyI would rather not find out if I am right or wrong, but other than likely surgical strikes at specific targets, I really dont see them turning the land mass into a bombed out waste land. How's Gates and other parsites and such gonna have all their land if its gone? The billionaire class wouldnt allow it.