Now now Sidoh, we wouldn't nuke them first. After all America could use a place to permanently store nuclear waste. Whats better that slowly killing the enemy with radiation poisoning and cancer?!
I should note that 80% of our population lives within 100km of the US border. If you did something that affects us, you also screw up Washington, Montana, North Dakota, Minnesota, Michigan, and all those stupid ones at the north-east. I doubt you'd want to do that!