If US declares war, not much Iran can do! 1-3 iranian bombs vs. the 20,000+ bombs in the US/Israeli/French and England's arsenal...don't be stupid...one to three untested iranian bombs does not a threat make...if they can't launch them. Besides, the USA has a major ax to grind when it comes to Iran....just wait you'll see.
Gunmen in Egypt kill guard outside Niger embassy (Reuters)
from the article: Iran could easily block vital oil route, admiral warns