I admit, I have not played this game much, but why is America rated so low? If you start with many cities, (have around 5 by the time you start a war) and aggressively get science, then become a warmonger! The B17 is a great attack vessel, and Manifest Destiny is great for early game. I played on a median difficulty with 20 civs, and 12 CS, but got into a quick war with Rome and Siam. Siam took Philadelphia, and I conquered Rome by turn 40. I got a science victory on turn 356, and continued playing. I now own two continents, have around 70 cities, and am at war with Persia. Using B17s helped me conquer the Maya, Osaka, Egypt, and Ethiopia. Only Bismarck, The Aztec, The Netherlands, The Ottomans, and The Aztec remain. I am hated by everyone, but because of my massive size, I will win by conquest by turn 600.