The Americans are indeed a top target, from the perspective of the military. Our goal is to maximize 'advantage', and Immortal vs Legionary or vs Hoplite is NOT the way to go. Now *if* we were in a position with barracks available, iron already online, and Rome not so far or not in hilly country, I would move for a very quick and very decisive now, do-or-die campaign vs Rome BEFORE they get legionaries. But as it stands now, America.
The other key reason why them is to avoid multiple fronts.If we go against any other civ, there is always the concern America will ally and we would be in a two front war. Instead, we destroy them, and strive to keep things on one front at a time.
14 turns to go before we can declare?? Ack! Be careful in the future about long agreements with incumbent targets
Actually, that'll be JUST ABOUT how long it will take to implement all that is laid out in the current military analysis, so not so bad.
We have MUCH to do to prepare in those 14 turns, much to do...
General Charis