I have said before (Especially in June 28, 2011) that G-d only swore not to flood the entire earth again, but he can still destroy single nations, like he did with ancient Egypt and Cennan, where men married men and women married women, and they had sex with anything that moved.
So let's see........ Why would G-d want to destroy America??? Anyone have an answer??? Hmmmmmmm. Intresting.